6656507839 has 2 divisors, whose sum is σ = 6656507840. Its totient is φ = 6656507838.

The previous prime is 6656507831. The next prime is 6656507843. The reversal of 6656507839 is 9387056566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6656507839 - 2³ = 6656507831 is a prime.

It is a super-2 number, since 2×6656507839² = 88618193221336899842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6656507839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656507831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328253919 + 3328253920.

It is an arithmetic number, because the mean of its divisors is an integer number (3328253920).

Almost surely, 2^6656507839 is an apocalyptic number.

6656507839 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656507839 is an equidigital number, since it uses as much as digits as its factorization.

6656507839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The square root of 6656507839 is about 81587.4245150562. The cubic root of 6656507839 is about 1881.1155894830.

The spelling of 6656507839 in words is "six billion, six hundred fifty-six million, five hundred seven thousand, eight hundred thirty-nine".