65642637140 has 24 divisors (see below), whose sum is σ = 137923451232. Its totient is φ = 26242976160.

The previous prime is 65642637139. The next prime is 65642637143. The reversal of 65642637140 is 4173624656.

65642637140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 65642637091 and 65642637100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65642637143) 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, 841646 + ... + 916325.

It is an arithmetic number, because the mean of its divisors is an integer number (5746810468).

Almost surely, 2^65642637140 is an apocalyptic number.

It is an amenable number.

65642637140 is an abundant number, since it is smaller than the sum of its proper divisors (72280814092).

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

65642637140 is a wasteful number, since it uses less digits than its factorization.

65642637140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759847 (or 1759845 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 65642637140 in words is "sixty-five billion, six hundred forty-two million, six hundred thirty-seven thousand, one hundred forty".