667417715440 has 80 divisors (see below), whose sum is σ = 1776166175232. Its totient is φ = 228475130112.

The previous prime is 667417715389. The next prime is 667417715441. The reversal of 667417715440 is 44517714766.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667417715441) 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, 558714 + ... + 1283353.

Almost surely, 2^667417715440 is an apocalyptic number.

It is an amenable number.

667417715440 is an abundant number, since it is smaller than the sum of its proper divisors (1108748459792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667417715440 is a wasteful number, since it uses less digits than its factorization.

667417715440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842734 (or 1842728 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 52.

The spelling of 667417715440 in words is "six hundred sixty-seven billion, four hundred seventeen million, seven hundred fifteen thousand, four hundred forty".