65397638885 has 16 divisors (see below), whose sum is σ = 78628132080. Its totient is φ = 52217548800.

The previous prime is 65397638857. The next prime is 65397638983. The reversal of 65397638885 is 58883679356.

It can be written as a sum of positive squares in 8 ways, for example, as 292033921 + 65105604964 = 17089^2 + 255158^2 .

It is not a de Polignac number, because 65397638885 - 2¹² = 65397634789 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 9756035 + ... + 9762735.

It is an arithmetic number, because the mean of its divisors is an integer number (4914258255).

Almost surely, 2^65397638885 is an apocalyptic number.

It is an amenable number.

65397638885 is a deficient number, since it is larger than the sum of its proper divisors (13230493195).

65397638885 is a wasteful number, since it uses less digits than its factorization.

65397638885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10168.

The product of its digits is 261273600, while the sum is 68.

The spelling of 65397638885 in words is "sixty-five billion, three hundred ninety-seven million, six hundred thirty-eight thousand, eight hundred eighty-five".