11656663005 has 64 divisors (see below), whose sum is σ = 21166935552. Its totient is φ = 5434598400.

The previous prime is 11656662991. The next prime is 11656663021. The reversal of 11656663005 is 50036665611.

It is not a de Polignac number, because 11656663005 - 2⁴ = 11656662989 is a prime.

It is a super-3 number, since 3×11656663005³ (a number of 31 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 440119 + ... + 465851.

It is an arithmetic number, because the mean of its divisors is an integer number (330733368).

Almost surely, 2^11656663005 is an apocalyptic number.

11656663005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11656663005 is a deficient number, since it is larger than the sum of its proper divisors (9510272547).

11656663005 is a wasteful number, since it uses less digits than its factorization.

11656663005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25878.

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 11656663005 in words is "eleven billion, six hundred fifty-six million, six hundred sixty-three thousand, five".