1642125645 has 48 divisors (see below), whose sum is σ = 3009936384. Its totient is φ = 826848000.

The previous prime is 1642125637. The next prime is 1642125647. The reversal of 1642125645 is 5465212461.

1642125645 is a `hidden beast` number, since 1 + 6 + 4 + 2 + 1 + 2 + 5 + 645 = 666.

It is not a de Polignac number, because 1642125645 - 2³ = 1642125637 is a prime.

It is a super-3 number, since 3×1642125645³ (a number of 29 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642125647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42840 + ... + 71550.

It is an arithmetic number, because the mean of its divisors is an integer number (62707008).

Almost surely, 2^1642125645 is an apocalyptic number.

1642125645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1642125645 is a deficient number, since it is larger than the sum of its proper divisors (1367810739).

1642125645 is a wasteful number, since it uses less digits than its factorization.

1642125645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28794 (or 28791 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 1642125645 is about 40523.1494950726. The cubic root of 1642125645 is about 1179.7829834075.

The spelling of 1642125645 in words is "one billion, six hundred forty-two million, one hundred twenty-five thousand, six hundred forty-five".