166621340 has 24 divisors (see below), whose sum is σ = 350453040. Its totient is φ = 66544128.

The previous prime is 166621337. The next prime is 166621379. The reversal of 166621340 is 43126661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7271 + ... + 19649.

It is an arithmetic number, because the mean of its divisors is an integer number (14602210).

Almost surely, 2^166621340 is an apocalyptic number.

166621340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166621340 is an abundant number, since it is smaller than the sum of its proper divisors (183831700).

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

166621340 is a wasteful number, since it uses less digits than its factorization.

166621340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13061 (or 13059 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 166621340 is about 12908.1888737344. The cubic root of 166621340 is about 550.2713151739.

The spelling of 166621340 in words is "one hundred sixty-six million, six hundred twenty-one thousand, three hundred forty".