65657640740 has 12 divisors (see below), whose sum is σ = 137881045596. Its totient is φ = 26263056288.

The previous prime is 65657640739. The next prime is 65657640809. The reversal of 65657640740 is 4704675656.

It can be written as a sum of positive squares in 2 ways, for example, as 34212421156 + 31445219584 = 184966^2 + 177328^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1641440999 + ... + 1641441038.

It is an arithmetic number, because the mean of its divisors is an integer number (11490087133).

Almost surely, 2^65657640740 is an apocalyptic number.

It is an amenable number.

65657640740 is an abundant number, since it is smaller than the sum of its proper divisors (72223404856).

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

65657640740 is a wasteful number, since it uses less digits than its factorization.

65657640740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282882046 (or 3282882044 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 65657640740 in words is "sixty-five billion, six hundred fifty-seven million, six hundred forty thousand, seven hundred forty".