661934439166 has 64 divisors (see below), whose sum is σ = 1334385110016. Its totient is φ = 237833625600.

The previous prime is 661934439143. The next prime is 661934439193.

661934439166 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 661934439166.

It is a congruent number.

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, 1972606 + ... + 2283646.

It is an arithmetic number, because the mean of its divisors is an integer number (20849767344).

Almost surely, 2^661934439166 is an apocalyptic number.

661934439166 is an abundant number, since it is smaller than the sum of its proper divisors (672450670850).

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

661934439166 is a wasteful number, since it uses less digits than its factorization.

661934439166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312137.

The product of its digits is 15116544, while the sum is 58.

The spelling of 661934439166 in words is "six hundred sixty-one billion, nine hundred thirty-four million, four hundred thirty-nine thousand, one hundred sixty-six".