815166 has 48 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 234960.

The previous prime is 815159. The next prime is 815173. The reversal of 815166 is 661518.

815166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (815159) and next prime (815173).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4465 + ... + 4643.

It is an arithmetic number, because the mean of its divisors is an integer number (42120).

2⁸¹⁵¹⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010880).

815166 is an abundant number, since it is smaller than the sum of its proper divisors (1206594).

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

815166 is a wasteful number, since it uses less digits than its factorization.

815166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 218 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 815166 is about 902.8654384791. The cubic root of 815166 is about 93.4147277495.

The spelling of 815166 in words is "eight hundred fifteen thousand, one hundred sixty-six".