645415646631 has 16 divisors (see below), whose sum is σ = 999613306368. Its totient is φ = 362762892000.

The previous prime is 645415646543. The next prime is 645415646713. The reversal of 645415646631 is 136646514546.

645415646631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645415646631 - 2³⁰ = 644341904807 is a prime.

It is a super-2 number, since 2×645415646631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645415641631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251917395 + ... + 251919956.

It is an arithmetic number, because the mean of its divisors is an integer number (62475831648).

Almost surely, 2^645415646631 is an apocalyptic number.

645415646631 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

645415646631 is a deficient number, since it is larger than the sum of its proper divisors (354197659737).

645415646631 is a wasteful number, since it uses less digits than its factorization.

645415646631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503837422.

The product of its digits is 6220800, while the sum is 51.

The spelling of 645415646631 in words is "six hundred forty-five billion, four hundred fifteen million, six hundred forty-six thousand, six hundred thirty-one".