61657818988 has 6 divisors (see below), whose sum is σ = 107901183236. Its totient is φ = 30828909492.

The previous prime is 61657818979. The next prime is 61657819009. The reversal of 61657818988 is 88981875616.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7707227370 + ... + 7707227377.

Almost surely, 2^61657818988 is an apocalyptic number.

It is an amenable number.

61657818988 is a deficient number, since it is larger than the sum of its proper divisors (46243364248).

61657818988 is a wasteful number, since it uses less digits than its factorization.

61657818988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15414454751 (or 15414454749 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 67.

The spelling of 61657818988 in words is "sixty-one billion, six hundred fifty-seven million, eight hundred eighteen thousand, nine hundred eighty-eight".