3676955816521 has 9 divisors (see below), whose sum is σ = 3981582699879. Its totient is φ = 3394090050936.

The previous prime is 3676955816507. The next prime is 3676955816533. The reversal of 3676955816521 is 1256185596763.

It is a happy number.

The square root of 3676955816521 is 1917539.

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

It can be written as a sum of positive squares in only one way, i.e., 543928375225 + 3133027441296 = 737515^2 + 1770036^2 .

It is not a de Polignac number, because 3676955816521 - 2²³ = 3676947427913 is a prime.

It is a super-2 number, since 2×3676955816521² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3676955816561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24854256 + ... + 25001758.

Almost surely, 2^{3676955816521} is an apocalyptic number.

3676955816521 is the 1917539-th square number.

3676955816521 is the 958770-th centered octagonal number.

It is an amenable number.

3676955816521 is a deficient number, since it is larger than the sum of its proper divisors (304626883358).

3676955816521 is an frugal number, since it uses more digits than its factorization.

3676955816521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295032 (or 147516 counting only the distinct ones).

The product of its digits is 81648000, while the sum is 64.

Multiplying 3676955816521 by its sum of digits (64), we get a square (235325172257344 = 15340312²).

The spelling of 3676955816521 in words is "three trillion, six hundred seventy-six billion, nine hundred fifty-five million, eight hundred sixteen thousand, five hundred twenty-one".