11624987161 has 4 divisors (see below), whose sum is σ = 11625894324. Its totient is φ = 11624080000.

The previous prime is 11624987149. The next prime is 11624987167. The reversal of 11624987161 is 16178942611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16178942611 = 13 ⋅1244534047.

It can be written as a sum of positive squares in 2 ways, for example, as 5785123600 + 5839863561 = 76060^2 + 76419^2 .

It is a cyclic number.

It is not a de Polignac number, because 11624987161 - 2³³ = 3035052569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11624987167) 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, 434080 + ... + 460081.

It is an arithmetic number, because the mean of its divisors is an integer number (2906473581).

Almost surely, 2^11624987161 is an apocalyptic number.

It is an amenable number.

11624987161 is a deficient number, since it is larger than the sum of its proper divisors (907163).

11624987161 is an equidigital number, since it uses as much as digits as its factorization.

11624987161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907162.

The product of its digits is 145152, while the sum is 46.

The spelling of 11624987161 in words is "eleven billion, six hundred twenty-four million, nine hundred eighty-seven thousand, one hundred sixty-one".