6369795721 has 3 divisors (see below), whose sum is σ = 6369875533. Its totient is φ = 6369715910.

The previous prime is 6369795667. The next prime is 6369795749. The reversal of 6369795721 is 1275979636.

The square root of 6369795721 is 79811.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 6369795721 - 2¹⁷ = 6369664649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6369795121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 39906 + ... + 119716.

Almost surely, 2^6369795721 is an apocalyptic number.

6369795721 is the 79811-st square number.

6369795721 is the 39906-th centered octagonal number.

It is an amenable number.

6369795721 is a deficient number, since it is larger than the sum of its proper divisors (79812).

6369795721 is an frugal number, since it uses more digits than its factorization.

6369795721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159622 (or 79811 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 55.

The cubic root of 6369795721 is about 1853.7101798652.

The spelling of 6369795721 in words is "six billion, three hundred sixty-nine million, seven hundred ninety-five thousand, seven hundred twenty-one".