65630511621 has 12 divisors (see below), whose sum is σ = 95224741248. Its totient is φ = 43557468264.

The previous prime is 65630511601. The next prime is 65630511629. The reversal of 65630511621 is 12611503656.

65630511621 is a `hidden beast` number, since 6 + 5 + 630 + 5 + 1 + 16 + 2 + 1 = 666.

It is not a de Polignac number, because 65630511621 - 2¹⁴ = 65630495237 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65630511629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16348395 + ... + 16352408.

It is an arithmetic number, because the mean of its divisors is an integer number (7935395104).

Almost surely, 2^65630511621 is an apocalyptic number.

It is an amenable number.

65630511621 is a deficient number, since it is larger than the sum of its proper divisors (29594229627).

65630511621 is a wasteful number, since it uses less digits than its factorization.

65630511621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32701032 (or 32701029 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 65630511621 in words is "sixty-five billion, six hundred thirty million, five hundred eleven thousand, six hundred twenty-one".