645325560431 has 16 divisors (see below), whose sum is σ = 678476745600. Its totient is φ = 613064712960.

The previous prime is 645325560421. The next prime is 645325560443. The reversal of 645325560431 is 134065523546.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645325560431 is a prime.

It is a super-2 number, since 2×645325560431² (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 (645325560421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291395 + ... + 1172843.

It is an arithmetic number, because the mean of its divisors is an integer number (42404796600).

Almost surely, 2^645325560431 is an apocalyptic number.

645325560431 is a deficient number, since it is larger than the sum of its proper divisors (33151185169).

645325560431 is a wasteful number, since it uses less digits than its factorization.

645325560431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881954.

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 645325560431 in words is "six hundred forty-five billion, three hundred twenty-five million, five hundred sixty thousand, four hundred thirty-one".