6990823057 has 2 divisors, whose sum is σ = 6990823058. Its totient is φ = 6990823056.

The previous prime is 6990823003. The next prime is 6990823097. The reversal of 6990823057 is 7503280996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6959563776 + 31259281 = 83424^2 + 5591^2 .

It is a cyclic number.

It is not a de Polignac number, because 6990823057 - 2¹⁹ = 6990298769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6990823057.

It is not a weakly prime, because it can be changed into another prime (6990823097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495411528 + 3495411529.

It is an arithmetic number, because the mean of its divisors is an integer number (3495411529).

Almost surely, 2^6990823057 is an apocalyptic number.

It is an amenable number.

6990823057 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990823057 is an equidigital number, since it uses as much as digits as its factorization.

6990823057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 6990823057 is about 83611.1419429253. The cubic root of 6990823057 is about 1912.0948714654.

The spelling of 6990823057 in words is "six billion, nine hundred ninety million, eight hundred twenty-three thousand, fifty-seven".