11661165663 has 16 divisors (see below), whose sum is σ = 17771308800. Its totient is φ = 6662805696.

The previous prime is 11661165661. The next prime is 11661165721. The reversal of 11661165663 is 36656116611.

It is not a de Polignac number, because 11661165663 - 2¹ = 11661165661 is a prime.

It is a super-3 number, since 3×11661165663³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661165661) 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 15 ways as a sum of consecutive naturals, for example, 217288 + ... + 265586.

It is an arithmetic number, because the mean of its divisors is an integer number (1110706800).

Almost surely, 2^11661165663 is an apocalyptic number.

11661165663 is a deficient number, since it is larger than the sum of its proper divisors (6110143137).

11661165663 is a wasteful number, since it uses less digits than its factorization.

11661165663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59806.

The product of its digits is 116640, while the sum is 42.

The spelling of 11661165663 in words is "eleven billion, six hundred sixty-one million, one hundred sixty-five thousand, six hundred sixty-three".