6369470721 has 20 divisors (see below), whose sum is σ = 9530792964. Its totient is φ = 4239216000.

The previous prime is 6369470647. The next prime is 6369470741. The reversal of 6369470721 is 1270749636.

6369470721 is a `hidden beast` number, since 636 + 9 + 4 + 7 + 0 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2517530625 + 3851940096 = 50175^2 + 62064^2 .

It is not a de Polignac number, because 6369470721 - 2¹¹ = 6369468673 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6369470741) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16740 + ... + 114101.

Almost surely, 2^6369470721 is an apocalyptic number.

It is an amenable number.

6369470721 is a deficient number, since it is larger than the sum of its proper divisors (3161322243).

6369470721 is a wasteful number, since it uses less digits than its factorization.

6369470721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131454 (or 131445 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 6369470721 is about 79808.9639138361. The cubic root of 6369470721 is about 1853.6786526346.

The spelling of 6369470721 in words is "six billion, three hundred sixty-nine million, four hundred seventy thousand, seven hundred twenty-one".