645565254031 has 8 divisors (see below), whose sum is σ = 647846769024. Its totient is φ = 643285058520.

The previous prime is 645565254007. The next prime is 645565254071. The reversal of 645565254031 is 130452565546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645565254031 - 2⁷ = 645565253903 is a prime.

It is a super-2 number, since 2×645565254031² (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 (645565254001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655560 + ... + 1311826.

It is an arithmetic number, because the mean of its divisors is an integer number (80980846128).

Almost surely, 2^645565254031 is an apocalyptic number.

645565254031 is a deficient number, since it is larger than the sum of its proper divisors (2281514993).

645565254031 is a wasteful number, since it uses less digits than its factorization.

645565254031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659741.

The product of its (nonzero) digits is 2160000, while the sum is 46.

The spelling of 645565254031 in words is "six hundred forty-five billion, five hundred sixty-five million, two hundred fifty-four thousand, thirty-one".