166150621 has 24 divisors (see below), whose sum is σ = 210368760. Its totient is φ = 130056192.

The previous prime is 166150591. The next prime is 166150637. The reversal of 166150621 is 126051661.

It can be written as a sum of positive squares in 4 ways, for example, as 2592100 + 163558521 = 1610^2 + 12789^2 .

It is not a de Polignac number, because 166150621 - 2⁷ = 166150493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166150621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166150651) 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, 60445 + ... + 63133.

It is an arithmetic number, because the mean of its divisors is an integer number (8765365).

Almost surely, 2^166150621 is an apocalyptic number.

It is an amenable number.

166150621 is a deficient number, since it is larger than the sum of its proper divisors (44218139).

166150621 is a wasteful number, since it uses less digits than its factorization.

166150621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813 (or 2806 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 166150621 is about 12889.9426298180. The cubic root of 166150621 is about 549.7526391801.

The spelling of 166150621 in words is "one hundred sixty-six million, one hundred fifty thousand, six hundred twenty-one".