645535242535546 has 48 divisors (see below), whose sum is σ = 1065756153067200. Its totient is φ = 293032981296000.

The previous prime is 645535242535541. The next prime is 645535242535553.

645535242535546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645535242535546² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645535242535541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 576946755 + ... + 578064553.

It is an arithmetic number, because the mean of its divisors is an integer number (22203253188900).

Almost surely, 2^{645535242535546} is an apocalyptic number.

645535242535546 is a deficient number, since it is larger than the sum of its proper divisors (420220910531654).

645535242535546 is a wasteful number, since it uses less digits than its factorization.

645535242535546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121011 (or 1121000 counting only the distinct ones).

The product of its digits is 1296000000, while the sum is 64.

The spelling of 645535242535546 in words is "six hundred forty-five trillion, five hundred thirty-five billion, two hundred forty-two million, five hundred thirty-five thousand, five hundred forty-six".