661392293166 has 64 divisors (see below), whose sum is σ = 1605991760640. Its totient is φ = 200094844320.

The previous prime is 661392293101. The next prime is 661392293173.

661392293166 is a `hidden beast` number, since 6 + 6 + 1 + 392 + 2 + 93 + 166 = 666.

661392293166 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

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, 544080 + ... + 1272323.

It is an arithmetic number, because the mean of its divisors is an integer number (25093621260).

Almost surely, 2^661392293166 is an apocalyptic number.

661392293166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

661392293166 is an abundant number, since it is smaller than the sum of its proper divisors (944599467474).

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

661392293166 is a wasteful number, since it uses less digits than its factorization.

661392293166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817038 (or 1817032 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The spelling of 661392293166 in words is "six hundred sixty-one billion, three hundred ninety-two million, two hundred ninety-three thousand, one hundred sixty-six".