661056104 has 8 divisors (see below), whose sum is σ = 1239480210. Its totient is φ = 330528048.

The previous prime is 661056049. The next prime is 661056223. The reversal of 661056104 is 401650166.

It can be written as a sum of positive squares in only one way, i.e., 617522500 + 43533604 = 24850^2 + 6598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41315999 + ... + 41316014.

Almost surely, 2^661056104 is an apocalyptic number.

It is an amenable number.

661056104 is a deficient number, since it is larger than the sum of its proper divisors (578424106).

661056104 is a wasteful number, since it uses less digits than its factorization.

661056104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82632019 (or 82632015 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 661056104 is about 25711.0113375573. The cubic root of 661056104 is about 871.1229187096.

The spelling of 661056104 in words is "six hundred sixty-one million, fifty-six thousand, one hundred four".