6656257971 has 32 divisors (see below), whose sum is σ = 11007786240. Its totient is φ = 3940272000.

The previous prime is 6656257939. The next prime is 6656257981. The reversal of 6656257971 is 1797526566.

6656257971 is a `hidden beast` number, since 6 + 6 + 5 + 62 + 579 + 7 + 1 = 666.

It is not a de Polignac number, because 6656257971 - 2⁵ = 6656257939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6656257901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247830 + ... + 273371.

It is an arithmetic number, because the mean of its divisors is an integer number (343993320).

Almost surely, 2^6656257971 is an apocalyptic number.

6656257971 is a deficient number, since it is larger than the sum of its proper divisors (4351528269).

6656257971 is a wasteful number, since it uses less digits than its factorization.

6656257971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521264 (or 521258 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The square root of 6656257971 is about 81585.8932107751. The cubic root of 6656257971 is about 1881.0920517922.

The spelling of 6656257971 in words is "six billion, six hundred fifty-six million, two hundred fifty-seven thousand, nine hundred seventy-one".