65140438940 has 24 divisors (see below), whose sum is σ = 138668827920. Its totient is φ = 25699241088.

The previous prime is 65140438939. The next prime is 65140438963. The reversal of 65140438940 is 4983404156.

It is a junction number, because it is equal to n+sod(n) for n = 65140438891 and 65140438900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22306910 + ... + 22309829.

It is an arithmetic number, because the mean of its divisors is an integer number (5777867830).

Almost surely, 2^65140438940 is an apocalyptic number.

It is an amenable number.

65140438940 is an abundant number, since it is smaller than the sum of its proper divisors (73528388980).

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

65140438940 is a wasteful number, since it uses less digits than its factorization.

65140438940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44616821 (or 44616819 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 65140438940 in words is "sixty-five billion, one hundred forty million, four hundred thirty-eight thousand, nine hundred forty".