166695380 has 18 divisors (see below), whose sum is σ = 350181594. Its totient is φ = 66655056.

The previous prime is 166695367. The next prime is 166695383. The reversal of 166695380 is 83596661.

It can be written as a sum of positive squares in only one way, i.e., 133356304 + 33339076 = 11548^2 + 5774^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166695383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56297 + ... + 59183.

It is an arithmetic number, because the mean of its divisors is an integer number (19454533).

Almost surely, 2^166695380 is an apocalyptic number.

166695380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166695380 is an abundant number, since it is smaller than the sum of its proper divisors (183486214).

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

166695380 is an frugal number, since it uses more digits than its factorization.

166695380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5783 (or 2894 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 166695380 is about 12911.0565020838. The cubic root of 166695380 is about 550.3528094470.

Multiplying 166695380 by its product of nonzero digits (233280), we get a square (38886698246400 = 6235920²).

The spelling of 166695380 in words is "one hundred sixty-six million, six hundred ninety-five thousand, three hundred eighty".