61791886457 has 16 divisors (see below), whose sum is σ = 73701418752. Its totient is φ = 50653616640.

The previous prime is 61791886447. The next prime is 61791886477. The reversal of 61791886457 is 75468819716.

It is a cyclic number.

It is not a de Polignac number, because 61791886457 - 2²⁰ = 61790837881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61791886457.

It is not an unprimeable number, because it can be changed into a prime (61791886447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1119533 + ... + 1173429.

It is an arithmetic number, because the mean of its divisors is an integer number (4606338672).

Almost surely, 2^61791886457 is an apocalyptic number.

It is an amenable number.

61791886457 is a deficient number, since it is larger than the sum of its proper divisors (11909532295).

61791886457 is a wasteful number, since it uses less digits than its factorization.

61791886457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61048.

The product of its digits is 20321280, while the sum is 62.

The spelling of 61791886457 in words is "sixty-one billion, seven hundred ninety-one million, eight hundred eighty-six thousand, four hundred fifty-seven".