3636408721969 has 9 divisors (see below), whose sum is σ = 3659167620633. Its totient is φ = 3613790542212.

The previous prime is 3636408721951. The next prime is 3636408722029. The reversal of 3636408721969 is 9691278046363.

The square root of 3636408721969 is 1906937.

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

3636408721969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3636408721969 - 2¹¹ = 3636408719921 is a prime.

It is a super-2 number, since 2×3636408721969² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3636408721969.

It is not an unprimeable number, because it can be changed into a prime (3636408724969) 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, 310824882 + ... + 310836580.

Almost surely, 2^{3636408721969} is an apocalyptic number.

3636408721969 is the 1906937-th square number.

3636408721969 is the 953469-th centered octagonal number.

It is an amenable number.

3636408721969 is a deficient number, since it is larger than the sum of its proper divisors (22758898664).

3636408721969 is an frugal number, since it uses more digits than its factorization.

3636408721969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23724 (or 11862 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 64.

Multiplying 3636408721969 by its sum of digits (64), we get a square (232730158206016 = 15255496²).

The spelling of 3636408721969 in words is "three trillion, six hundred thirty-six billion, four hundred eight million, seven hundred twenty-one thousand, nine hundred sixty-nine".