66105561011660 has 96 divisors (see below), whose sum is σ = 140599080236160. Its totient is φ = 26105280233472.

The previous prime is 66105561011653. The next prime is 66105561011689. The reversal of 66105561011660 is 6611016550166.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4416156656 + ... + 4416171624.

It is an arithmetic number, because the mean of its divisors is an integer number (1464573752460).

Almost surely, 2^{66105561011660} is an apocalyptic number.

It is an amenable number.

66105561011660 is an abundant number, since it is smaller than the sum of its proper divisors (74493519224500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66105561011660 is a wasteful number, since it uses less digits than its factorization.

66105561011660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21507 (or 21505 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 66105561011660 in words is "sixty-six trillion, one hundred five billion, five hundred sixty-one million, eleven thousand, six hundred sixty".