11653412661 has 24 divisors (see below), whose sum is σ = 18390921120. Its totient is φ = 7051917600.

The previous prime is 11653412629. The next prime is 11653412677. The reversal of 11653412661 is 16621435611.

11653412661 is a `hidden beast` number, since 116 + 534 + 1 + 2 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 11653412661 - 2⁵ = 11653412629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11653411661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24070 + ... + 154551.

It is an arithmetic number, because the mean of its divisors is an integer number (766288380).

Almost surely, 2^11653412661 is an apocalyptic number.

11653412661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11653412661 is a deficient number, since it is larger than the sum of its proper divisors (6737508459).

11653412661 is a wasteful number, since it uses less digits than its factorization.

11653412661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179297 (or 179294 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The spelling of 11653412661 in words is "eleven billion, six hundred fifty-three million, four hundred twelve thousand, six hundred sixty-one".