166751379990 has 96 divisors (see below), whose sum is σ = 467067365856. Its totient is φ = 41032120320.

The previous prime is 166751379983. The next prime is 166751380001. The reversal of 166751379990 is 99973157661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3534537 + ... + 3581403.

It is an arithmetic number, because the mean of its divisors is an integer number (4865285061).

Almost surely, 2^166751379990 is an apocalyptic number.

166751379990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166751379990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233533682928).

166751379990 is an abundant number, since it is smaller than the sum of its proper divisors (300315985866).

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

166751379990 is a wasteful number, since it uses less digits than its factorization.

166751379990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49934 (or 49931 counting only the distinct ones).

The product of its (nonzero) digits is 19289340, while the sum is 63.

The spelling of 166751379990 in words is "one hundred sixty-six billion, seven hundred fifty-one million, three hundred seventy-nine thousand, nine hundred ninety".