51661104602 has 16 divisors (see below), whose sum is σ = 82054548072. Its totient is φ = 24309757440.

The previous prime is 51661104589. The next prime is 51661104623. The reversal of 51661104602 is 20640116615.

It can be written as a sum of positive squares in 4 ways, for example, as 51501309721 + 159794881 = 226939^2 + 12641^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855518 + ... + 913910.

Almost surely, 2^51661104602 is an apocalyptic number.

51661104602 is a deficient number, since it is larger than the sum of its proper divisors (30393443470).

51661104602 is a wasteful number, since it uses less digits than its factorization.

51661104602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84433.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 51661104602 in words is "fifty-one billion, six hundred sixty-one million, one hundred four thousand, six hundred two".