65571979825 has 24 divisors (see below), whose sum is σ = 88725883680. Its totient is φ = 47675337600.

The previous prime is 65571979817. The next prime is 65571979831. The reversal of 65571979825 is 52897917556.

It is a happy number.

It is not a de Polignac number, because 65571979825 - 2³ = 65571979817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1007677 + ... + 1070773.

It is an arithmetic number, because the mean of its divisors is an integer number (3696911820).

Almost surely, 2^65571979825 is an apocalyptic number.

It is an amenable number.

65571979825 is a deficient number, since it is larger than the sum of its proper divisors (23153903855).

65571979825 is a wasteful number, since it uses less digits than its factorization.

65571979825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66897 (or 66892 counting only the distinct ones).

The product of its digits is 47628000, while the sum is 64.

The spelling of 65571979825 in words is "sixty-five billion, five hundred seventy-one million, nine hundred seventy-nine thousand, eight hundred twenty-five".