11523431655 has 16 divisors (see below), whose sum is σ = 20486100960. Its totient is φ = 6145830144.

The previous prime is 11523431653. The next prime is 11523431671. The reversal of 11523431655 is 55613432511.

11523431655 is a `hidden beast` number, since 1 + 152 + 343 + 165 + 5 = 666.

It is not a de Polignac number, because 11523431655 - 2¹ = 11523431653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11523431651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42679242 + ... + 42679511.

It is an arithmetic number, because the mean of its divisors is an integer number (1280381310).

Almost surely, 2^11523431655 is an apocalyptic number.

11523431655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11523431655 is a deficient number, since it is larger than the sum of its proper divisors (8962669305).

11523431655 is an equidigital number, since it uses as much as digits as its factorization.

11523431655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85358767 (or 85358761 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The spelling of 11523431655 in words is "eleven billion, five hundred twenty-three million, four hundred thirty-one thousand, six hundred fifty-five".