11637406657 has 4 divisors (see below), whose sum is σ = 11645834836. Its totient is φ = 11628978480.

The previous prime is 11637406643. The next prime is 11637406673. The reversal of 11637406657 is 75660473611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75660473611 = 7687 ⋅9842653.

It can be written as a sum of positive squares in 2 ways, for example, as 5596386481 + 6041020176 = 74809^2 + 77724^2 .

It is a cyclic number.

It is not a de Polignac number, because 11637406657 - 2¹⁵ = 11637373889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11637406637) 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, 4212018 + ... + 4214779.

It is an arithmetic number, because the mean of its divisors is an integer number (2911458709).

Almost surely, 2^11637406657 is an apocalyptic number.

It is an amenable number.

11637406657 is a deficient number, since it is larger than the sum of its proper divisors (8428179).

11637406657 is an equidigital number, since it uses as much as digits as its factorization.

11637406657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8428178.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 11637406657 in words is "eleven billion, six hundred thirty-seven million, four hundred six thousand, six hundred fifty-seven".