11656611506 has 8 divisors (see below), whose sum is σ = 18048946944. Its totient is φ = 5640295860.

The previous prime is 11656611503. The next prime is 11656611521. The reversal of 11656611506 is 60511665611.

11656611506 is nontrivially palindromic in base 16.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 11656611506.

It is not an unprimeable number, because it can be changed into a prime (11656611503) 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, 94004870 + ... + 94004993.

It is an arithmetic number, because the mean of its divisors is an integer number (2256118368).

Almost surely, 2^11656611506 is an apocalyptic number.

11656611506 is a deficient number, since it is larger than the sum of its proper divisors (6392335438).

11656611506 is a wasteful number, since it uses less digits than its factorization.

11656611506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188009896.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 11656611506 in words is "eleven billion, six hundred fifty-six million, six hundred eleven thousand, five hundred six".