690956400857 has 2 divisors, whose sum is σ = 690956400858. Its totient is φ = 690956400856.

The previous prime is 690956400853. The next prime is 690956400917. The reversal of 690956400857 is 758004659096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633980620441 + 56975780416 = 796229^2 + 238696^2 .

It is a cyclic number.

It is not a de Polignac number, because 690956400857 - 2² = 690956400853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690956400796 and 690956400805.

It is not a weakly prime, because it can be changed into another prime (690956400853) 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, 345478200428 + 345478200429.

It is an arithmetic number, because the mean of its divisors is an integer number (345478200429).

Almost surely, 2^690956400857 is an apocalyptic number.

It is an amenable number.

690956400857 is a deficient number, since it is larger than the sum of its proper divisors (1).

690956400857 is an equidigital number, since it uses as much as digits as its factorization.

690956400857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16329600, while the sum is 59.

The spelling of 690956400857 in words is "six hundred ninety billion, nine hundred fifty-six million, four hundred thousand, eight hundred fifty-seven".