3690475365721 has 9 divisors (see below), whose sum is σ = 3695840991741. Its totient is φ = 3685117526592.

The previous prime is 3690475365719. The next prime is 3690475365737. The reversal of 3690475365721 is 1275635740963.

The square root of 3690475365721 is 1921061.

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

3690475365721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 135968450121 + 3554506915600 = 368739^2 + 1885340^2 .

It is not a de Polignac number, because 3690475365721 - 2¹ = 3690475365719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3690475365701) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2376351681 + ... + 2376353233.

Almost surely, 2^{3690475365721} is an apocalyptic number.

3690475365721 is the 1921061-st square number.

3690475365721 is the 960531-st centered octagonal number.

It is an amenable number.

3690475365721 is a deficient number, since it is larger than the sum of its proper divisors (5365626020).

3690475365721 is an frugal number, since it uses more digits than its factorization.

3690475365721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580 (or 2790 counting only the distinct ones).

The product of its (nonzero) digits is 28576800, while the sum is 58.

It can be divided in two parts, 3690475 and 365721, that added together give a square (4056196 = 2014²).

The spelling of 3690475365721 in words is "three trillion, six hundred ninety billion, four hundred seventy-five million, three hundred sixty-five thousand, seven hundred twenty-one".