166323885065920 has 448 divisors, whose sum is σ = 427877957145600. Its totient is φ = 61391910666240.

The previous prime is 166323885065909. The next prime is 166323885065971. The reversal of 166323885065920 is 29560588323661.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31930096276 + ... + 31930101484.

Almost surely, 2^{166323885065920} is an apocalyptic number.

166323885065920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166323885065920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213938978572800).

166323885065920 is an abundant number, since it is smaller than the sum of its proper divisors (261554072079680).

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

166323885065920 is a wasteful number, since it uses less digits than its factorization.

166323885065920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6176 (or 6166 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 64.

The spelling of 166323885065920 in words is "one hundred sixty-six trillion, three hundred twenty-three billion, eight hundred eighty-five million, sixty-five thousand, nine hundred twenty".