645056626361 has 48 divisors (see below), whose sum is σ = 793548336000. Its totient is φ = 513486839808.

The previous prime is 645056626351. The next prime is 645056626393. The reversal of 645056626361 is 163626650546.

It is not a de Polignac number, because 645056626361 - 2¹⁰ = 645056625337 is a prime.

It is a super-4 number, since 4×645056626361⁴ (a number of 48 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (645056626351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68479910 + ... + 68489328.

It is an arithmetic number, because the mean of its divisors is an integer number (16532257000).

Almost surely, 2^645056626361 is an apocalyptic number.

It is an amenable number.

645056626361 is a deficient number, since it is larger than the sum of its proper divisors (148491709639).

645056626361 is a wasteful number, since it uses less digits than its factorization.

645056626361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9906 (or 9889 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 645056626361 in words is "six hundred forty-five billion, fifty-six million, six hundred twenty-six thousand, three hundred sixty-one".