61856593921 has 8 divisors (see below), whose sum is σ = 65919331584. Its totient is φ = 57908299680.

The previous prime is 61856593891. The next prime is 61856593937. The reversal of 61856593921 is 12939565816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61856593921 - 2⁷ = 61856593793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61856593951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28609740 + ... + 28611901.

It is an arithmetic number, because the mean of its divisors is an integer number (8239916448).

Almost surely, 2^61856593921 is an apocalyptic number.

It is an amenable number.

61856593921 is a deficient number, since it is larger than the sum of its proper divisors (4062737663).

61856593921 is a wasteful number, since it uses less digits than its factorization.

61856593921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57221711.

The product of its digits is 3499200, while the sum is 55.

The spelling of 61856593921 in words is "sixty-one billion, eight hundred fifty-six million, five hundred ninety-three thousand, nine hundred twenty-one".