6656877551 has 4 divisors (see below), whose sum is σ = 6657219072. Its totient is φ = 6656536032.

The previous prime is 6656877541. The next prime is 6656877581. The reversal of 6656877551 is 1557786566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6656877551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656877541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139631 + ... + 181136.

It is an arithmetic number, because the mean of its divisors is an integer number (1664304768).

Almost surely, 2^6656877551 is an apocalyptic number.

6656877551 is a deficient number, since it is larger than the sum of its proper divisors (341521).

6656877551 is a wasteful number, since it uses less digits than its factorization.

6656877551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341520.

The product of its digits is 10584000, while the sum is 56.

The square root of 6656877551 is about 81589.6902249298. The cubic root of 6656877551 is about 1881.1504154583.

The spelling of 6656877551 in words is "six billion, six hundred fifty-six million, eight hundred seventy-seven thousand, five hundred fifty-one".