166899390 has 48 divisors (see below), whose sum is σ = 465959952. Its totient is φ = 38148096.

The previous prime is 166899373. The next prime is 166899391. The reversal of 166899390 is 93998661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166899391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55299 + ... + 58238.

It is an arithmetic number, because the mean of its divisors is an integer number (9707499).

Almost surely, 2^166899390 is an apocalyptic number.

166899390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166899390 is an abundant number, since it is smaller than the sum of its proper divisors (299060562).

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

166899390 is a wasteful number, since it uses less digits than its factorization.

166899390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113561 (or 113554 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 166899390 is about 12918.9546790752. The cubic root of 166899390 is about 550.5772341915.

The spelling of 166899390 in words is "one hundred sixty-six million, eight hundred ninety-nine thousand, three hundred ninety".