3698686700809 has 3 divisors (see below), whose sum is σ = 3698688624007. Its totient is φ = 3698684777612.

The previous prime is 3698686700777. The next prime is 3698686700833. The reversal of 3698686700809 is 9080076868963.

The square root of 3698686700809 is 1923197.

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., 2676217887225 + 1022468813584 = 1635915^2 + 1011172^2 .

It is not a de Polignac number, because 3698686700809 - 2⁵ = 3698686700777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3698686700209) 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, 961599 + ... + 2884795.

Almost surely, 2^{3698686700809} is an apocalyptic number.

3698686700809 is the 1923197-th square number.

3698686700809 is the 961599-th centered octagonal number.

It is an amenable number.

3698686700809 is a deficient number, since it is larger than the sum of its proper divisors (1923198).

3698686700809 is an frugal number, since it uses more digits than its factorization.

3698686700809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846394 (or 1923197 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 70.

The spelling of 3698686700809 in words is "three trillion, six hundred ninety-eight billion, six hundred eighty-six million, seven hundred thousand, eight hundred nine".