6556999667 has 2 divisors, whose sum is σ = 6556999668. Its totient is φ = 6556999666.

The previous prime is 6556999651. The next prime is 6556999711. The reversal of 6556999667 is 7669996556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6556999667 - 2⁴ = 6556999651 is a prime.

It is a super-2 number, since 2×6556999667² = 85988489266076221778, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6556999597 and 6556999606.

It is not a weakly prime, because it can be changed into another prime (6556959667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278499833 + 3278499834.

It is an arithmetic number, because the mean of its divisors is an integer number (3278499834).

Almost surely, 2^6556999667 is an apocalyptic number.

6556999667 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556999667 is an equidigital number, since it uses as much as digits as its factorization.

6556999667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165337200, while the sum is 68.

The square root of 6556999667 is about 80975.3028212924. The cubic root of 6556999667 is about 1871.6948865774.

The spelling of 6556999667 in words is "six billion, five hundred fifty-six million, nine hundred ninety-nine thousand, six hundred sixty-seven".