166381390 has 16 divisors (see below), whose sum is σ = 342270432. Its totient is φ = 57045024.

The previous prime is 166381387. The next prime is 166381393. The reversal of 166381390 is 93183661.

It is an interprime number because it is at equal distance from previous prime (166381387) and next prime (166381393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166381393) 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, 1188369 + ... + 1188508.

It is an arithmetic number, because the mean of its divisors is an integer number (21391902).

Almost surely, 2^166381390 is an apocalyptic number.

166381390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166381390 is an abundant number, since it is smaller than the sum of its proper divisors (175889042).

166381390 is a wasteful number, since it uses less digits than its factorization.

166381390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376891.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 166381390 is about 12898.8910376047. The cubic root of 166381390 is about 550.0070412322.

The spelling of 166381390 in words is "one hundred sixty-six million, three hundred eighty-one thousand, three hundred ninety".