6656857620 has 96 divisors (see below), whose sum is σ = 22555024128. Its totient is φ = 1432061952.

The previous prime is 6656857591. The next prime is 6656857631. The reversal of 6656857620 is 267586566.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 459027 + ... + 473306.

It is an arithmetic number, because the mean of its divisors is an integer number (234948168).

Almost surely, 2^6656857620 is an apocalyptic number.

6656857620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6656857620 is an abundant number, since it is smaller than the sum of its proper divisors (15898166508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6656857620 is a wasteful number, since it uses less digits than its factorization.

6656857620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932369 (or 932367 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 51.

The square root of 6656857620 is about 81589.5680831808. The cubic root of 6656857620 is about 1881.1485380392.

The spelling of 6656857620 in words is "six billion, six hundred fifty-six million, eight hundred fifty-seven thousand, six hundred twenty".