1625945445 has 18 divisors (see below), whose sum is σ = 2818774374. Its totient is φ = 867026640.

The previous prime is 1625945429. The next prime is 1625945449. The reversal of 1625945445 is 5445495261.

1625945445 is a `hidden beast` number, since 1 + 6 + 2 + 594 + 54 + 4 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1300756356 + 325189089 = 36066^2 + 18033^2 .

It is not a de Polignac number, because 1625945445 - 2⁴ = 1625945429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1625945445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625945449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 267490 + ... + 273500.

Almost surely, 2^1625945445 is an apocalyptic number.

1625945445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1625945445 is a deficient number, since it is larger than the sum of its proper divisors (1192828929).

1625945445 is an frugal number, since it uses more digits than its factorization.

1625945445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12033 (or 6019 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 1625945445 is about 40323.0138382537. The cubic root of 1625945445 is about 1175.8953055659.

Multiplying 1625945445 by its sum of digits (45), we get a square (73167545025 = 270495²).

1625945445 divided by its sum of digits (45) gives a square (36132121 = 6011²).

The spelling of 1625945445 in words is "one billion, six hundred twenty-five million, nine hundred forty-five thousand, four hundred forty-five".