1645456425 has 12 divisors (see below), whose sum is σ = 2720488080. Its totient is φ = 877576720.

The previous prime is 1645456381. The next prime is 1645456429. The reversal of 1645456425 is 5246545461.

It is not a de Polignac number, because 1645456425 - 2¹⁰ = 1645455401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645456429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10969635 + ... + 10969784.

It is an arithmetic number, because the mean of its divisors is an integer number (226707340).

Almost surely, 2^1645456425 is an apocalyptic number.

1645456425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645456425 is a deficient number, since it is larger than the sum of its proper divisors (1075031655).

1645456425 is a wasteful number, since it uses less digits than its factorization.

1645456425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21939432 (or 21939427 counting only the distinct ones).

The product of its digits is 576000, while the sum is 42.

The square root of 1645456425 is about 40564.2259263011. The cubic root of 1645456425 is about 1180.5801095229.

The spelling of 1645456425 in words is "one billion, six hundred forty-five million, four hundred fifty-six thousand, four hundred twenty-five".