666508811252 has 48 divisors (see below), whose sum is σ = 1182389655552. Its totient is φ = 328717025280.

The previous prime is 666508811209. The next prime is 666508811273. The reversal of 666508811252 is 252118805666.

It is a self number, because there is not a number n which added to its sum of digits gives 666508811252.

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, 123585068 + ... + 123590460.

It is an arithmetic number, because the mean of its divisors is an integer number (24633117824).

Almost surely, 2^666508811252 is an apocalyptic number.

It is an amenable number.

666508811252 is a deficient number, since it is larger than the sum of its proper divisors (515880844300).

666508811252 is a wasteful number, since it uses less digits than its factorization.

666508811252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6888 (or 6886 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 666508811252 in words is "six hundred sixty-six billion, five hundred eight million, eight hundred eleven thousand, two hundred fifty-two".