65573839920 has 80 divisors (see below), whose sum is σ = 203396169312. Its totient is φ = 17476270080.

The previous prime is 65573839907. The next prime is 65573839921. The reversal of 65573839920 is 2993837556.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (65573839921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342790 + ... + 498650.

Almost surely, 2^65573839920 is an apocalyptic number.

65573839920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65573839920 is an abundant number, since it is smaller than the sum of its proper divisors (137822329392).

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

65573839920 is a wasteful number, since it uses less digits than its factorization.

65573839920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157630 (or 157624 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 57.

The spelling of 65573839920 in words is "sixty-five billion, five hundred seventy-three million, eight hundred thirty-nine thousand, nine hundred twenty".