65115139992 has 96 divisors (see below), whose sum is σ = 189442897200. Its totient is φ = 18596718336.

The previous prime is 65115139927. The next prime is 65115139993. The reversal of 65115139992 is 29993151156.

65115139992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65115139993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3269938 + ... + 3289790.

Almost surely, 2^65115139992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65115139992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94721448600).

65115139992 is an abundant number, since it is smaller than the sum of its proper divisors (124327757208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65115139992 is a wasteful number, since it uses less digits than its factorization.

65115139992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22665 (or 22654 counting only the distinct ones).

The product of its digits is 656100, while the sum is 51.

The spelling of 65115139992 in words is "sixty-five billion, one hundred fifteen million, one hundred thirty-nine thousand, nine hundred ninety-two".