166751980 has 96 divisors (see below), whose sum is σ = 396264960. Its totient is φ = 58567680.

The previous prime is 166751971. The next prime is 166751983. The reversal of 166751980 is 89157661.

It is a happy number.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (166751983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 536025 + ... + 536335.

It is an arithmetic number, because the mean of its divisors is an integer number (4127760).

Almost surely, 2^166751980 is an apocalyptic number.

166751980 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 166751980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198132480).

166751980 is an abundant number, since it is smaller than the sum of its proper divisors (229512980).

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

166751980 is a wasteful number, since it uses less digits than its factorization.

166751980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 166751980 is about 12913.2482358235. The cubic root of 166751980 is about 550.4150916052.

The spelling of 166751980 in words is "one hundred sixty-six million, seven hundred fifty-one thousand, nine hundred eighty".