645239969932546 has 32 divisors (see below), whose sum is σ = 975587109235200. Its totient is φ = 320055755952000.

The previous prime is 645239969932529. The next prime is 645239969932573.

645239969932546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645239969932546² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645239969932546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257477310 + ... + 259971238.

It is an arithmetic number, because the mean of its divisors is an integer number (30487097163600).

Almost surely, 2^{645239969932546} is an apocalyptic number.

645239969932546 is a deficient number, since it is larger than the sum of its proper divisors (330347139302654).

645239969932546 is a wasteful number, since it uses less digits than its factorization.

645239969932546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496234.

The product of its digits is 20407334400, while the sum is 82.

The spelling of 645239969932546 in words is "six hundred forty-five trillion, two hundred thirty-nine billion, nine hundred sixty-nine million, nine hundred thirty-two thousand, five hundred forty-six".