11687021523 has 8 divisors (see below), whose sum is σ = 17314106000. Its totient is φ = 7791347664.

The previous prime is 11687021513. The next prime is 11687021627. The reversal of 11687021523 is 32512078611.

11687021523 is a `hidden beast` number, since 1 + 1 + 68 + 70 + 2 + 1 + 523 = 666.

It is not a de Polignac number, because 11687021523 - 2⁵ = 11687021491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11687021503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216426298 + ... + 216426351.

It is an arithmetic number, because the mean of its divisors is an integer number (2164263250).

Almost surely, 2^11687021523 is an apocalyptic number.

11687021523 is a deficient number, since it is larger than the sum of its proper divisors (5627084477).

11687021523 is an equidigital number, since it uses as much as digits as its factorization.

11687021523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432852658 (or 432852652 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 11687021523 in words is "eleven billion, six hundred eighty-seven million, twenty-one thousand, five hundred twenty-three".