645441604611 has 32 divisors (see below), whose sum is σ = 911877711360. Its totient is φ = 404950980096.

The previous prime is 645441604597. The next prime is 645441604657. The reversal of 645441604611 is 116406144546.

It is not a de Polignac number, because 645441604611 - 2¹¹ = 645441602563 is a prime.

It is a super-2 number, since 2×645441604611² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645441604411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55988130 + ... + 55999656.

It is an arithmetic number, because the mean of its divisors is an integer number (28496178480).

Almost surely, 2^645441604611 is an apocalyptic number.

645441604611 is a deficient number, since it is larger than the sum of its proper divisors (266436106749).

645441604611 is a wasteful number, since it uses less digits than its factorization.

645441604611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17963.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 645441604611 in words is "six hundred forty-five billion, four hundred forty-one million, six hundred four thousand, six hundred eleven".