645115655613 has 16 divisors (see below), whose sum is σ = 1010530817856. Its totient is φ = 360903863040.

The previous prime is 645115655551. The next prime is 645115655623. The reversal of 645115655613 is 316556511546.

It is a happy number.

It is not a de Polignac number, because 645115655613 - 2¹⁸ = 645115393469 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645115655623) 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, 751882620 + ... + 751883477.

It is an arithmetic number, because the mean of its divisors is an integer number (63158176116).

Almost surely, 2^645115655613 is an apocalyptic number.

It is an amenable number.

645115655613 is a deficient number, since it is larger than the sum of its proper divisors (365415162243).

645115655613 is a wasteful number, since it uses less digits than its factorization.

645115655613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503766124.

The product of its digits is 1620000, while the sum is 48.

The spelling of 645115655613 in words is "six hundred forty-five billion, one hundred fifteen million, six hundred fifty-five thousand, six hundred thirteen".