65313808581 has 72 divisors (see below), whose sum is σ = 105348561600. Its totient is φ = 35977697280.

The previous prime is 65313808579. The next prime is 65313808621. The reversal of 65313808581 is 18580831356.

It is not a de Polignac number, because 65313808581 - 2¹ = 65313808579 is a prime.

It is a super-2 number, since 2×65313808581² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65313808581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65313808501) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 254139205 + ... + 254139461.

Almost surely, 2^65313808581 is an apocalyptic number.

It is an amenable number.

65313808581 is a deficient number, since it is larger than the sum of its proper divisors (40034753019).

65313808581 is an frugal number, since it uses more digits than its factorization.

65313808581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 65313808581 in words is "sixty-five billion, three hundred thirteen million, eight hundred eight thousand, five hundred eighty-one".