65481931977 has 16 divisors (see below), whose sum is σ = 108853082112. Its totient is φ = 34016587920.

The previous prime is 65481931973. The next prime is 65481932027. The reversal of 65481931977 is 77913918456.

It is not a de Polignac number, because 65481931977 - 2² = 65481931973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65481931977.

It is not an unprimeable number, because it can be changed into a prime (65481931973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141735553 + ... + 141736014.

It is an arithmetic number, because the mean of its divisors is an integer number (6803317632).

Almost surely, 2^65481931977 is an apocalyptic number.

It is an amenable number.

65481931977 is a deficient number, since it is larger than the sum of its proper divisors (43371150135).

65481931977 is a wasteful number, since it uses less digits than its factorization.

65481931977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283471588.

The product of its digits is 11430720, while the sum is 60.

The spelling of 65481931977 in words is "sixty-five billion, four hundred eighty-one million, nine hundred thirty-one thousand, nine hundred seventy-seven".