65409723988 has 24 divisors (see below), whose sum is σ = 137704683200. Its totient is φ = 26557331328.

The previous prime is 65409723971. The next prime is 65409723997. The reversal of 65409723988 is 88932790456.

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, 61474773 + ... + 61475836.

Almost surely, 2^65409723988 is an apocalyptic number.

It is an amenable number.

65409723988 is an abundant number, since it is smaller than the sum of its proper divisors (72294959212).

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

65409723988 is a wasteful number, since it uses less digits than its factorization.

65409723988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122950639 (or 122950637 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 65409723988 in words is "sixty-five billion, four hundred nine million, seven hundred twenty-three thousand, nine hundred eighty-eight".