166054881 has 4 divisors (see below), whose sum is σ = 221406512. Its totient is φ = 110703252.

The previous prime is 166054873. The next prime is 166054897. The reversal of 166054881 is 188450661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 166054881 - 2³ = 166054873 is a prime.

It is a super-2 number, since 2×166054881² = 55148447007848322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166054831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27675811 + ... + 27675816.

It is an arithmetic number, because the mean of its divisors is an integer number (55351628).

Almost surely, 2^166054881 is an apocalyptic number.

It is an amenable number.

166054881 is a deficient number, since it is larger than the sum of its proper divisors (55351631).

166054881 is an equidigital number, since it uses as much as digits as its factorization.

166054881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55351630.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 166054881 is about 12886.2283465722. The cubic root of 166054881 is about 549.6470253098.

The spelling of 166054881 in words is "one hundred sixty-six million, fifty-four thousand, eight hundred eighty-one".