65720641940 has 24 divisors (see below), whose sum is σ = 139760355840. Its totient is φ = 25955493408.

The previous prime is 65720641897. The next prime is 65720641981. The reversal of 65720641940 is 4914602756.

It is a junction number, because it is equal to n+sod(n) for n = 65720641891 and 65720641900.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20796092 + ... + 20799251.

It is an arithmetic number, because the mean of its divisors is an integer number (5823348160).

Almost surely, 2^65720641940 is an apocalyptic number.

It is an amenable number.

65720641940 is an abundant number, since it is smaller than the sum of its proper divisors (74039713900).

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

65720641940 is a wasteful number, since it uses less digits than its factorization.

65720641940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41595431 (or 41595429 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 65720641940 in words is "sixty-five billion, seven hundred twenty million, six hundred forty-one thousand, nine hundred forty".