11666565105 has 16 divisors (see below), whose sum is σ = 20102389440. Its totient is φ = 5743539648.

The previous prime is 11666565073. The next prime is 11666565109. The reversal of 11666565105 is 50156566611.

It is not a de Polignac number, because 11666565105 - 2⁵ = 11666565073 is a prime.

It is a super-2 number, since 2×11666565105² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11666565109) 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, 29914075 + ... + 29914464.

It is an arithmetic number, because the mean of its divisors is an integer number (1256399340).

Almost surely, 2^11666565105 is an apocalyptic number.

11666565105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11666565105 is a deficient number, since it is larger than the sum of its proper divisors (8435824335).

11666565105 is a wasteful number, since it uses less digits than its factorization.

11666565105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59828560.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 11666565105 in words is "eleven billion, six hundred sixty-six million, five hundred sixty-five thousand, one hundred five".