166156720 has 40 divisors (see below), whose sum is σ = 387122544. Its totient is φ = 66323712.

The previous prime is 166156699. The next prime is 166156721. The reversal of 166156720 is 27651661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×166156720³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (166156721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41862 + ... + 45658.

Almost surely, 2^166156720 is an apocalyptic number.

166156720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166156720 is an abundant number, since it is smaller than the sum of its proper divisors (220965824).

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

166156720 is a wasteful number, since it uses less digits than its factorization.

166156720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4357 (or 4351 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 166156720 is about 12890.1792074432. The cubic root of 166156720 is about 549.7593658083.

The spelling of 166156720 in words is "one hundred sixty-six million, one hundred fifty-six thousand, seven hundred twenty".