690666413 has 2 divisors, whose sum is σ = 690666414. Its totient is φ = 690666412.

The previous prime is 690666313. The next prime is 690666419. The reversal of 690666413 is 314666096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662650564 + 28015849 = 25742^2 + 5293^2 .

It is a cyclic number.

It is not a de Polignac number, because 690666413 - 2¹⁰ = 690665389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690666419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345333206 + 345333207.

It is an arithmetic number, because the mean of its divisors is an integer number (345333207).

Almost surely, 2^690666413 is an apocalyptic number.

It is an amenable number.

690666413 is a deficient number, since it is larger than the sum of its proper divisors (1).

690666413 is an equidigital number, since it uses as much as digits as its factorization.

690666413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 690666413 is about 26280.5329664373. The cubic root of 690666413 is about 883.9399835895.

The spelling of 690666413 in words is "six hundred ninety million, six hundred sixty-six thousand, four hundred thirteen".