6990418873157 has 2 divisors, whose sum is σ = 6990418873158. Its totient is φ = 6990418873156.

The previous prime is 6990418873147. The next prime is 6990418873159. The reversal of 6990418873157 is 7513788140996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4154397838756 + 2836021034401 = 2038234^2 + 1684049^2 .

It is a cyclic number.

It is not a de Polignac number, because 6990418873157 - 2¹⁸ = 6990418611013 is a prime.

Together with 6990418873159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6990418873159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495209436578 + 3495209436579.

It is an arithmetic number, because the mean of its divisors is an integer number (3495209436579).

Almost surely, 2^{6990418873157} is an apocalyptic number.

It is an amenable number.

6990418873157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990418873157 is an equidigital number, since it uses as much as digits as its factorization.

6990418873157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91445760, while the sum is 68.

The spelling of 6990418873157 in words is "six trillion, nine hundred ninety billion, four hundred eighteen million, eight hundred seventy-three thousand, one hundred fifty-seven".