661056650166 has 64 divisors (see below), whose sum is σ = 1457152849152. Its totient is φ = 198268560000.

The previous prime is 661056650153. The next prime is 661056650203.

661056650166 is nontrivially palindromic in base 10.

It is a congruent number.

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, 2389476 + ... + 2651736.

It is an arithmetic number, because the mean of its divisors is an integer number (22768013268).

Almost surely, 2^661056650166 is an apocalyptic number.

661056650166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

661056650166 is an abundant number, since it is smaller than the sum of its proper divisors (796096198986).

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

661056650166 is a wasteful number, since it uses less digits than its factorization.

661056650166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262669.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 661056650166 in words is "six hundred sixty-one billion, fifty-six million, six hundred fifty thousand, one hundred sixty-six".