166215740 has 12 divisors (see below), whose sum is σ = 349053096. Its totient is φ = 66486288.

The previous prime is 166215701. The next prime is 166215761. The reversal of 166215740 is 47512661.

It is a junction number, because it is equal to n+sod(n) for n = 166215697 and 166215706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4155374 + ... + 4155413.

It is an arithmetic number, because the mean of its divisors is an integer number (29087758).

Almost surely, 2^166215740 is an apocalyptic number.

166215740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166215740 is an abundant number, since it is smaller than the sum of its proper divisors (182837356).

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

166215740 is a wasteful number, since it uses less digits than its factorization.

166215740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8310796 (or 8310794 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 166215740 is about 12892.4683439596. The cubic root of 166215740 is about 549.8244508612.

The spelling of 166215740 in words is "one hundred sixty-six million, two hundred fifteen thousand, seven hundred forty".