6721022725 has 12 divisors (see below), whose sum is σ = 8352160740. Its totient is φ = 5365145600.

The previous prime is 6721022719. The next prime is 6721022729. The reversal of 6721022725 is 5272201276.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 75186241 + 6645836484 = 8671^2 + 81522^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6721022725 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721022729) 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, 280060 + ... + 303109.

It is an arithmetic number, because the mean of its divisors is an integer number (696013395).

Almost surely, 2^6721022725 is an apocalyptic number.

It is an amenable number.

6721022725 is a deficient number, since it is larger than the sum of its proper divisors (1631138015).

6721022725 is a wasteful number, since it uses less digits than its factorization.

6721022725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583640 (or 583635 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 6721022725 is about 81981.8438741164. The cubic root of 6721022725 is about 1887.1733194843.

The spelling of 6721022725 in words is "six billion, seven hundred twenty-one million, twenty-two thousand, seven hundred twenty-five".