210166138 has 32 divisors (see below), whose sum is σ = 410828544. Its totient is φ = 78250752.

The previous prime is 210166079. The next prime is 210166141. The reversal of 210166138 is 831661012.

210166138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 30870 + ... + 37057.

It is an arithmetic number, because the mean of its divisors is an integer number (12838392).

Almost surely, 2^210166138 is an apocalyptic number.

210166138 is a deficient number, since it is larger than the sum of its proper divisors (200662406).

210166138 is a wasteful number, since it uses less digits than its factorization.

210166138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67966.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 210166138 is about 14497.1079184781. The cubic root of 210166138 is about 594.5489017846.

The spelling of 210166138 in words is "two hundred ten million, one hundred sixty-six thousand, one hundred thirty-eight".