666734807540 has 48 divisors (see below), whose sum is σ = 1473919009920. Its totient is φ = 252642971520.

The previous prime is 666734807527. The next prime is 666734807561. The reversal of 666734807540 is 45708437666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8554145 + ... + 8631735.

It is an arithmetic number, because the mean of its divisors is an integer number (30706646040).

Almost surely, 2^666734807540 is an apocalyptic number.

It is an amenable number.

666734807540 is an abundant number, since it is smaller than the sum of its proper divisors (807184202380).

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

666734807540 is a wasteful number, since it uses less digits than its factorization.

666734807540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100232 (or 100230 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 56.

The spelling of 666734807540 in words is "six hundred sixty-six billion, seven hundred thirty-four million, eight hundred seven thousand, five hundred forty".