690908557439 has 2 divisors, whose sum is σ = 690908557440. Its totient is φ = 690908557438.

The previous prime is 690908557363. The next prime is 690908557459. The reversal of 690908557439 is 934755809096.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690908557439 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690908557459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345454278719 + 345454278720.

It is an arithmetic number, because the mean of its divisors is an integer number (345454278720).

Almost surely, 2^690908557439 is an apocalyptic number.

690908557439 is a deficient number, since it is larger than the sum of its proper divisors (1).

690908557439 is an equidigital number, since it uses as much as digits as its factorization.

690908557439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73483200, while the sum is 65.

The spelling of 690908557439 in words is "six hundred ninety billion, nine hundred eight million, five hundred fifty-seven thousand, four hundred thirty-nine".