201550166 has 4 divisors (see below), whose sum is σ = 302325252. Its totient is φ = 100775082.

The previous prime is 201550123. The next prime is 201550169. The reversal of 201550166 is 661055102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661055102 = 2 ⋅330527551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201550169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50387540 + ... + 50387543.

It is an arithmetic number, because the mean of its divisors is an integer number (75581313).

Almost surely, 2^201550166 is an apocalyptic number.

201550166 is a deficient number, since it is larger than the sum of its proper divisors (100775086).

201550166 is a wasteful number, since it uses less digits than its factorization.

201550166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100775085.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 201550166 is about 14196.8364785962. The cubic root of 201550166 is about 586.3105650714.

The spelling of 201550166 in words is "two hundred one million, five hundred fifty thousand, one hundred sixty-six".