6650722521 has 12 divisors (see below), whose sum is σ = 9722342448. Its totient is φ = 4380395064.

The previous prime is 6650722517. The next prime is 6650722531. The reversal of 6650722521 is 1252270566.

6650722521 is a `hidden beast` number, since 6 + 65 + 0 + 72 + 2 + 521 = 666.

It is not a de Polignac number, because 6650722521 - 2² = 6650722517 is a prime.

It is a super-2 number, since 2×6650722521² = 88464220102673190882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6650722501) 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, 4450875 + ... + 4452368.

It is an arithmetic number, because the mean of its divisors is an integer number (810195204).

Almost surely, 2^6650722521 is an apocalyptic number.

It is an amenable number.

6650722521 is a deficient number, since it is larger than the sum of its proper divisors (3071619927).

6650722521 is a wasteful number, since it uses less digits than its factorization.

6650722521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8903332 (or 8903329 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 6650722521 is about 81551.9620916628. The cubic root of 6650722521 is about 1880.5704584870.

The spelling of 6650722521 in words is "six billion, six hundred fifty million, seven hundred twenty-two thousand, five hundred twenty-one".