201645650 has 12 divisors (see below), whose sum is σ = 375061002. Its totient is φ = 80658240.

The previous prime is 201645649. The next prime is 201645701. The reversal of 201645650 is 56546102.

It can be written as a sum of positive squares in 3 ways, for example, as 153190129 + 48455521 = 12377^2 + 6961^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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, 2016407 + ... + 2016506.

Almost surely, 2^201645650 is an apocalyptic number.

201645650 is a deficient number, since it is larger than the sum of its proper divisors (173415352).

201645650 is a wasteful number, since it uses less digits than its factorization.

201645650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032925 (or 4032920 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 201645650 is about 14200.1989422684. The cubic root of 201645650 is about 586.4031382849.

The spelling of 201645650 in words is "two hundred one million, six hundred forty-five thousand, six hundred fifty".