166121650 has 12 divisors (see below), whose sum is σ = 308986362. Its totient is φ = 66448640.

The previous prime is 166121633. The next prime is 166121689. The reversal of 166121650 is 56121661.

166121650 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 149401729 + 16719921 = 12223^2 + 4089^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1661167 + ... + 1661266.

Almost surely, 2^166121650 is an apocalyptic number.

166121650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166121650 is a deficient number, since it is larger than the sum of its proper divisors (142864712).

166121650 is a wasteful number, since it uses less digits than its factorization.

166121650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322445 (or 3322440 counting only the distinct ones).

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

The square root of 166121650 is about 12888.8187977021. The cubic root of 166121650 is about 549.7206846211.

The spelling of 166121650 in words is "one hundred sixty-six million, one hundred twenty-one thousand, six hundred fifty".