645272256431 has 32 divisors (see below), whose sum is σ = 740227120128. Its totient is φ = 556776253440.

The previous prime is 645272256403. The next prime is 645272256451. The reversal of 645272256431 is 134652272546.

It is not a de Polignac number, because 645272256431 - 2¹⁸ = 645271994287 is a prime.

It is a super-2 number, since 2×645272256431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645272256451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19368470 + ... + 19401756.

It is an arithmetic number, because the mean of its divisors is an integer number (23132097504).

Almost surely, 2^645272256431 is an apocalyptic number.

645272256431 is a deficient number, since it is larger than the sum of its proper divisors (94954863697).

645272256431 is a wasteful number, since it uses less digits than its factorization.

645272256431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33911.

The product of its digits is 2419200, while the sum is 47.

The spelling of 645272256431 in words is "six hundred forty-five billion, two hundred seventy-two million, two hundred fifty-six thousand, four hundred thirty-one".