6990220957 has 2 divisors, whose sum is σ = 6990220958. Its totient is φ = 6990220956.

The previous prime is 6990220943. The next prime is 6990221003. The reversal of 6990220957 is 7590220996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6338388996 + 651831961 = 79614^2 + 25531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6990220957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6990220957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6990220057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495110478 + 3495110479.

It is an arithmetic number, because the mean of its divisors is an integer number (3495110479).

Almost surely, 2^6990220957 is an apocalyptic number.

It is an amenable number.

6990220957 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990220957 is an equidigital number, since it uses as much as digits as its factorization.

6990220957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 6990220957 is about 83607.5412687157. The cubic root of 6990220957 is about 1912.0399754317.

The spelling of 6990220957 in words is "six billion, nine hundred ninety million, two hundred twenty thousand, nine hundred fifty-seven".