65648772891 has 32 divisors (see below), whose sum is σ = 110899897920. Its totient is φ = 38022815232.

The previous prime is 65648772853. The next prime is 65648772899. The reversal of 65648772891 is 19827784656.

65648772891 is a `hidden beast` number, since 6 + 5 + 6 + 487 + 72 + 89 + 1 = 666.

It is not a de Polignac number, because 65648772891 - 2¹⁴ = 65648756507 is a prime.

It is a super-2 number, since 2×65648772891² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65648772899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5495020 + ... + 5506953.

It is an arithmetic number, because the mean of its divisors is an integer number (3465621810).

Almost surely, 2^65648772891 is an apocalyptic number.

65648772891 is a deficient number, since it is larger than the sum of its proper divisors (45251125029).

65648772891 is a wasteful number, since it uses less digits than its factorization.

65648772891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11002012 (or 11002006 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 65648772891 in words is "sixty-five billion, six hundred forty-eight million, seven hundred seventy-two thousand, eight hundred ninety-one".