689161608637 has 2 divisors, whose sum is σ = 689161608638. Its totient is φ = 689161608636.

The previous prime is 689161608599. The next prime is 689161608649. The reversal of 689161608637 is 736806161986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529534191481 + 159627417156 = 727691^2 + 399534^2 .

It is a cyclic number.

It is not a de Polignac number, because 689161608637 - 2¹¹ = 689161606589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689161908637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344580804318 + 344580804319.

It is an arithmetic number, because the mean of its divisors is an integer number (344580804319).

Almost surely, 2^689161608637 is an apocalyptic number.

It is an amenable number.

689161608637 is a deficient number, since it is larger than the sum of its proper divisors (1).

689161608637 is an equidigital number, since it uses as much as digits as its factorization.

689161608637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 689161608637 in words is "six hundred eighty-nine billion, one hundred sixty-one million, six hundred eight thousand, six hundred thirty-seven".