689696591401 has 2 divisors, whose sum is σ = 689696591402. Its totient is φ = 689696591400.

The previous prime is 689696591399. The next prime is 689696591411. The reversal of 689696591401 is 104195696986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406272386025 + 283424205376 = 637395^2 + 532376^2 .

It is a cyclic number.

It is not a de Polignac number, because 689696591401 - 2¹ = 689696591399 is a prime.

Together with 689696591399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (689696591411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344848295700 + 344848295701.

It is an arithmetic number, because the mean of its divisors is an integer number (344848295701).

Almost surely, 2^689696591401 is an apocalyptic number.

It is an amenable number.

689696591401 is a deficient number, since it is larger than the sum of its proper divisors (1).

689696591401 is an equidigital number, since it uses as much as digits as its factorization.

689696591401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25194240, while the sum is 64.

The spelling of 689696591401 in words is "six hundred eighty-nine billion, six hundred ninety-six million, five hundred ninety-one thousand, four hundred one".