666561572058 has 32 divisors (see below), whose sum is σ = 1338519686400. Its totient is φ = 221288038400.

The previous prime is 666561572023. The next prime is 666561572069. The reversal of 666561572058 is 850275165666.

666561572058 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 666561571989 and 666561572007.

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, 10996618 + ... + 11057066.

It is an arithmetic number, because the mean of its divisors is an integer number (41828740200).

Almost surely, 2^666561572058 is an apocalyptic number.

666561572058 is an abundant number, since it is smaller than the sum of its proper divisors (671958114342).

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

666561572058 is a wasteful number, since it uses less digits than its factorization.

666561572058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67862.

The product of its (nonzero) digits is 18144000, while the sum is 57.

The spelling of 666561572058 in words is "six hundred sixty-six billion, five hundred sixty-one million, five hundred seventy-two thousand, fifty-eight".