6556694987 has 2 divisors, whose sum is σ = 6556694988. Its totient is φ = 6556694986.

The previous prime is 6556694953. The next prime is 6556695029. The reversal of 6556694987 is 7894966556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6556694987 - 2²⁰ = 6555646411 is a prime.

It is not a weakly prime, because it can be changed into another prime (6556694917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278347493 + 3278347494.

It is an arithmetic number, because the mean of its divisors is an integer number (3278347494).

Almost surely, 2^6556694987 is an apocalyptic number.

6556694987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556694987 is an equidigital number, since it uses as much as digits as its factorization.

6556694987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97977600, while the sum is 65.

The square root of 6556694987 is about 80973.4214850774. The cubic root of 6556694987 is about 1871.6658958368.

The spelling of 6556694987 in words is "six billion, five hundred fifty-six million, six hundred ninety-four thousand, nine hundred eighty-seven".