166438827 has 16 divisors (see below), whose sum is σ = 246898080. Its totient is φ = 110814336.

The previous prime is 166438819. The next prime is 166438837. The reversal of 166438827 is 728834661.

It is not a de Polignac number, because 166438827 - 2³ = 166438819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166438807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19543 + ... + 26735.

It is an arithmetic number, because the mean of its divisors is an integer number (15431130).

Almost surely, 2^166438827 is an apocalyptic number.

166438827 is a deficient number, since it is larger than the sum of its proper divisors (80459253).

166438827 is an equidigital number, since it uses as much as digits as its factorization.

166438827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8059 (or 8053 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 166438827 is about 12901.1172771974. The cubic root of 166438827 is about 550.0703237903.

The spelling of 166438827 in words is "one hundred sixty-six million, four hundred thirty-eight thousand, eight hundred twenty-seven".