699091637689 has 3 divisors (see below), whose sum is σ = 699092473807. Its totient is φ = 699090801572.

The previous prime is 699091637677. The next prime is 699091637747. The reversal of 699091637689 is 986736190996.

The square root of 699091637689 is 836117.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 554317475625 + 144774162064 = 744525^2 + 380492^2 .

It is not a de Polignac number, because 699091637689 - 2¹⁵ = 699091604921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (699091637609) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 418059 + ... + 1254175.

Almost surely, 2^699091637689 is an apocalyptic number.

699091637689 is the 836117-th square number.

699091637689 is the 418059-th centered octagonal number.

It is an amenable number.

699091637689 is a deficient number, since it is larger than the sum of its proper divisors (836118).

699091637689 is an frugal number, since it uses more digits than its factorization.

699091637689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672234 (or 836117 counting only the distinct ones).

The product of its (nonzero) digits is 238085568, while the sum is 73.

The spelling of 699091637689 in words is "six hundred ninety-nine billion, ninety-one million, six hundred thirty-seven thousand, six hundred eighty-nine".