11637136961 has 4 divisors (see below), whose sum is σ = 11656761732. Its totient is φ = 11617512192.

The previous prime is 11637136919. The next prime is 11637136993. The reversal of 11637136961 is 16963173611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8128825600 + 3508311361 = 90160^2 + 59231^2 .

It is a cyclic number.

It is not a de Polignac number, because 11637136961 - 2⁶ = 11637136897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11637126961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9811496 + ... + 9812681.

It is an arithmetic number, because the mean of its divisors is an integer number (2914190433).

Almost surely, 2^11637136961 is an apocalyptic number.

It is an amenable number.

11637136961 is a deficient number, since it is larger than the sum of its proper divisors (19624771).

11637136961 is an equidigital number, since it uses as much as digits as its factorization.

11637136961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19624770.

The product of its digits is 122472, while the sum is 44.

The spelling of 11637136961 in words is "eleven billion, six hundred thirty-seven million, one hundred thirty-six thousand, nine hundred sixty-one".