65117981831 has 8 divisors (see below), whose sum is σ = 74623334400. Its totient is φ = 55663325208.

The previous prime is 65117981809. The next prime is 65117981833. The reversal of 65117981831 is 13818971156.

65117981831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 65117981831 - 2²² = 65113787527 is a prime.

It is a super-2 number, since 2×65117981831² (a number of 22 digits) contains 22 as substring.

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 65117981831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65117981833) 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, 12671231 + ... + 12676368.

It is an arithmetic number, because the mean of its divisors is an integer number (9327916800).

Almost surely, 2^65117981831 is an apocalyptic number.

65117981831 is a deficient number, since it is larger than the sum of its proper divisors (9505352569).

65117981831 is a wasteful number, since it uses less digits than its factorization.

65117981831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25347973.

The product of its digits is 362880, while the sum is 50.

The spelling of 65117981831 in words is "sixty-five billion, one hundred seventeen million, nine hundred eighty-one thousand, eight hundred thirty-one".