666121156117604 has 96 divisors (see below), whose sum is σ = 1343650115203200. Its totient is φ = 285767927976960.

The previous prime is 666121156117559. The next prime is 666121156117733. The reversal of 666121156117604 is 406711651121666.

666121156117604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7028252264 + ... + 7028347040.

It is an arithmetic number, because the mean of its divisors is an integer number (13996355366700).

Almost surely, 2^{666121156117604} is an apocalyptic number.

It is an amenable number.

666121156117604 is an abundant number, since it is smaller than the sum of its proper divisors (677528959085596).

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

666121156117604 is a wasteful number, since it uses less digits than its factorization.

666121156117604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126333 (or 126331 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 666121156117604 in words is "six hundred sixty-six trillion, one hundred twenty-one billion, one hundred fifty-six million, one hundred seventeen thousand, six hundred four".