61791392656 has 20 divisors (see below), whose sum is σ = 136823798272. Its totient is φ = 26482025376.

The previous prime is 61791392603. The next prime is 61791392687. The reversal of 61791392656 is 65629319716.

It is a junction number, because it is equal to n+sod(n) for n = 61791392597 and 61791392606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275854320 + ... + 275854543.

Almost surely, 2^61791392656 is an apocalyptic number.

It is an amenable number.

61791392656 is an abundant number, since it is smaller than the sum of its proper divisors (75032405616).

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

61791392656 is a wasteful number, since it uses less digits than its factorization.

61791392656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551708878 (or 551708872 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 55.

The spelling of 61791392656 in words is "sixty-one billion, seven hundred ninety-one million, three hundred ninety-two thousand, six hundred fifty-six".