65313621 has 60 divisors (see below), whose sum is σ = 108958080. Its totient is φ = 38841120.

The previous prime is 65313617. The next prime is 65313623. The reversal of 65313621 is 12631356.

65313621 is a `hidden beast` number, since 6 + 5 + 31 + 3 + 621 = 666.

It is not a de Polignac number, because 65313621 - 2² = 65313617 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (3240) is a multiple of the sum of its prime divisors (90).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65313623) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1765215 + ... + 1765251.

It is an arithmetic number, because the mean of its divisors is an integer number (1815968).

Almost surely, 2^65313621 is an apocalyptic number.

It is an amenable number.

65313621 is a deficient number, since it is larger than the sum of its proper divisors (43644459).

65313621 is a wasteful number, since it uses less digits than its factorization.

65313621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 90 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 65313621 is about 8081.6842922747. The cubic root of 65313621 is about 402.7181970872.

Adding to 65313621 its reverse (12631356), we get a palindrome (77944977).

The spelling of 65313621 in words is "sixty-five million, three hundred thirteen thousand, six hundred twenty-one".