166665716 has 48 divisors (see below), whose sum is σ = 343222656. Its totient is φ = 69341184.

The previous prime is 166665689. The next prime is 166665731. The reversal of 166665716 is 617566661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136340 + ... + 137556.

It is an arithmetic number, because the mean of its divisors is an integer number (7150472).

Almost surely, 2^166665716 is an apocalyptic number.

It is an amenable number.

166665716 is an abundant number, since it is smaller than the sum of its proper divisors (176556940).

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

166665716 is a wasteful number, since it uses less digits than its factorization.

166665716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1366 counting only the distinct ones).

The product of its digits is 272160, while the sum is 44.

The square root of 166665716 is about 12909.9076681439. The cubic root of 166665716 is about 550.3201618031.

The spelling of 166665716 in words is "one hundred sixty-six million, six hundred sixty-five thousand, seven hundred sixteen".