11635637641 has 8 divisors (see below), whose sum is σ = 12653062920. Its totient is φ = 10655209728.

The previous prime is 11635637627. The next prime is 11635637683. The reversal of 11635637641 is 14673653611.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8719637641 + 2916000000 = 93379^2 + 54000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11635637641 - 2⁷ = 11635637513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11635637341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9248686 + ... + 9249943.

It is an arithmetic number, because the mean of its divisors is an integer number (1581632865).

Almost surely, 2^11635637641 is an apocalyptic number.

It is an amenable number.

11635637641 is a deficient number, since it is larger than the sum of its proper divisors (1017425279).

11635637641 is a wasteful number, since it uses less digits than its factorization.

11635637641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18498683.

The product of its digits is 272160, while the sum is 43.

The spelling of 11635637641 in words is "eleven billion, six hundred thirty-five million, six hundred thirty-seven thousand, six hundred forty-one".