11818516369 has 9 divisors (see below), whose sum is σ = 12991915209. Its totient is φ = 10743018660.

The previous prime is 11818516327. The next prime is 11818516373. The reversal of 11818516369 is 96361581811.

It is a happy number.

The square root of 11818516369 is 108713.

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

It is not a de Polignac number, because 11818516369 - 2¹⁵ = 11818483601 is a prime.

It is a super-2 number, since 2×11818516369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11818516069) 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, 1190902 + ... + 1200784.

Almost surely, 2^11818516369 is an apocalyptic number.

11818516369 is the 108713-rd square number.

11818516369 is the 54357-th centered octagonal number.

It is an amenable number.

11818516369 is a deficient number, since it is larger than the sum of its proper divisors (1173398840).

11818516369 is an frugal number, since it uses more digits than its factorization.

11818516369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19788 (or 9894 counting only the distinct ones).

The product of its digits is 311040, while the sum is 49.

Multiplying 11818516369 by its sum of digits (49), we get a square (579107302081 = 760991²).

The spelling of 11818516369 in words is "eleven billion, eight hundred eighteen million, five hundred sixteen thousand, three hundred sixty-nine".