645440216116 has 24 divisors (see below), whose sum is σ = 1178686623744. Its totient is φ = 308673958560.

The previous prime is 645440216107. The next prime is 645440216117. The reversal of 645440216116 is 611612044546.

It is a happy number.

It is a super-2 number, since 2×645440216116² (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 (645440216117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1891426 + ... + 2206438.

It is an arithmetic number, because the mean of its divisors is an integer number (49111942656).

Almost surely, 2^645440216116 is an apocalyptic number.

It is an amenable number.

645440216116 is a deficient number, since it is larger than the sum of its proper divisors (533246407628).

645440216116 is a wasteful number, since it uses less digits than its factorization.

645440216116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337311 (or 337309 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 645440216116 in words is "six hundred forty-five billion, four hundred forty million, two hundred sixteen thousand, one hundred sixteen".