6988788788957 has 2 divisors, whose sum is σ = 6988788788958. Its totient is φ = 6988788788956.

The previous prime is 6988788788953. The next prime is 6988788788999. The reversal of 6988788788957 is 7598878878896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6752961033316 + 235827755641 = 2598646^2 + 485621^2 .

It is a cyclic number.

It is not a de Polignac number, because 6988788788957 - 2² = 6988788788953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6988788788953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494394394478 + 3494394394479.

It is an arithmetic number, because the mean of its divisors is an integer number (3494394394479).

Almost surely, 2^{6988788788957} is an apocalyptic number.

It is an amenable number.

6988788788957 is a deficient number, since it is larger than the sum of its proper divisors (1).

6988788788957 is an equidigital number, since it uses as much as digits as its factorization.

6988788788957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 218494402560, while the sum is 98.

The spelling of 6988788788957 in words is "six trillion, nine hundred eighty-eight billion, seven hundred eighty-eight million, seven hundred eighty-eight thousand, nine hundred fifty-seven".