166666590 has 24 divisors (see below), whose sum is σ = 433333368. Its totient is φ = 44444400.

The previous prime is 166666583. The next prime is 166666597. The reversal of 166666590 is 95666661.

It is an interprime number because it is at equal distance from previous prime (166666583) and next prime (166666597).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 925836 + ... + 926015.

It is an arithmetic number, because the mean of its divisors is an integer number (18055557).

Almost surely, 2^166666590 is an apocalyptic number.

166666590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166666590 is an abundant number, since it is smaller than the sum of its proper divisors (266666778).

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

166666590 is a wasteful number, since it uses less digits than its factorization.

166666590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851864 (or 1851861 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 166666590 is about 12909.9415180705. The cubic root of 166666590 is about 550.3211237665.

The spelling of 166666590 in words is "one hundred sixty-six million, six hundred sixty-six thousand, five hundred ninety".