6645682257 has 8 divisors (see below), whose sum is σ = 9146745600. Its totient is φ = 4287536880.

The previous prime is 6645682237. The next prime is 6645682321. The reversal of 6645682257 is 7522865466.

6645682257 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6645682257 - 2⁷ = 6645682129 is a prime.

It is a super-2 number, since 2×6645682257² = 88330185322009228098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6645682217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35729382 + ... + 35729567.

It is an arithmetic number, because the mean of its divisors is an integer number (1143343200).

Almost surely, 2^6645682257 is an apocalyptic number.

It is an amenable number.

6645682257 is a deficient number, since it is larger than the sum of its proper divisors (2501063343).

6645682257 is a wasteful number, since it uses less digits than its factorization.

6645682257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71458983.

The product of its digits is 4838400, while the sum is 51.

The square root of 6645682257 is about 81521.0540719390. The cubic root of 6645682257 is about 1880.0952736725.

The spelling of 6645682257 in words is "six billion, six hundred forty-five million, six hundred eighty-two thousand, two hundred fifty-seven".