65540638674 has 32 divisors (see below), whose sum is σ = 166452416640. Its totient is φ = 18725896656.

The previous prime is 65540638673. The next prime is 65540638687. The reversal of 65540638674 is 47683604556.

65540638674 is a `hidden beast` number, since 6 + 5 + 540 + 6 + 38 + 67 + 4 = 666.

65540638674 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 65540638674.

It is not an unprimeable number, because it can be changed into a prime (65540638673) 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, 86693589 + ... + 86694344.

It is an arithmetic number, because the mean of its divisors is an integer number (5201638020).

Almost surely, 2^65540638674 is an apocalyptic number.

65540638674 is an abundant number, since it is smaller than the sum of its proper divisors (100911777966).

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

65540638674 is a wasteful number, since it uses less digits than its factorization.

65540638674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173387951 (or 173387945 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 54.

The spelling of 65540638674 in words is "sixty-five billion, five hundred forty million, six hundred thirty-eight thousand, six hundred seventy-four".