661843348166 has 32 divisors (see below), whose sum is σ = 1332943250688. Its totient is φ = 238025579040.

The previous prime is 661843348163. The next prime is 661843348213.

661843348166 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661843348163) 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, 165293540 + ... + 165297543.

It is an arithmetic number, because the mean of its divisors is an integer number (41654476584).

Almost surely, 2^661843348166 is an apocalyptic number.

661843348166 is an abundant number, since it is smaller than the sum of its proper divisors (671099902522).

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

661843348166 is a wasteful number, since it uses less digits than its factorization.

661843348166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330591116.

The product of its digits is 11943936, while the sum is 56.

The spelling of 661843348166 in words is "six hundred sixty-one billion, eight hundred forty-three million, three hundred forty-eight thousand, one hundred sixty-six".