11688515621 has 16 divisors (see below), whose sum is σ = 12137280000. Its totient is φ = 11244441600.

The previous prime is 11688515581. The next prime is 11688515623. The reversal of 11688515621 is 12651588611.

It is a cyclic number.

It is not a de Polignac number, because 11688515621 - 2⁶ = 11688515557 is a prime.

It is a super-2 number, since 2×11688515621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11688515623) 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, 4345445 + ... + 4348133.

It is an arithmetic number, because the mean of its divisors is an integer number (758580000).

Almost surely, 2^11688515621 is an apocalyptic number.

It is an amenable number.

11688515621 is a deficient number, since it is larger than the sum of its proper divisors (448764379).

11688515621 is a wasteful number, since it uses less digits than its factorization.

11688515621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500.

The product of its digits is 115200, while the sum is 44.

The spelling of 11688515621 in words is "eleven billion, six hundred eighty-eight million, five hundred fifteen thousand, six hundred twenty-one".