11656009369 has 9 divisors (see below), whose sum is σ = 11777634687. Its totient is φ = 11535630624.

The previous prime is 11656009361. The next prime is 11656009373. The reversal of 11656009369 is 96390065611.

The square root of 11656009369 is 107963.

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., 3577594969 + 8078414400 = 59813^2 + 89880^2 .

It is not a de Polignac number, because 11656009369 - 2³ = 11656009361 is a prime.

It is a super-2 number, since 2×11656009369² (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 (11656009361) 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, 11551537 + ... + 11552545.

Almost surely, 2^11656009369 is an apocalyptic number.

11656009369 is the 107963-rd square number.

11656009369 is the 53982-nd centered octagonal number.

It is an amenable number.

11656009369 is a deficient number, since it is larger than the sum of its proper divisors (121625318).

11656009369 is an frugal number, since it uses more digits than its factorization.

11656009369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232 (or 1116 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 46.

The spelling of 11656009369 in words is "eleven billion, six hundred fifty-six million, nine thousand, three hundred sixty-nine".