201566738 has 16 divisors (see below), whose sum is σ = 314616960. Its totient is φ = 96775536.

The previous prime is 201566737. The next prime is 201566747. The reversal of 201566738 is 837665102.

It is not an unprimeable number, because it can be changed into a prime (201566737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15248 + ... + 25211.

It is an arithmetic number, because the mean of its divisors is an integer number (19663560).

Almost surely, 2^201566738 is an apocalyptic number.

201566738 is a deficient number, since it is larger than the sum of its proper divisors (113050222).

201566738 is a wasteful number, since it uses less digits than its factorization.

201566738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40561.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 201566738 is about 14197.4201177538. The cubic root of 201566738 is about 586.3266339780.

The spelling of 201566738 in words is "two hundred one million, five hundred sixty-six thousand, seven hundred thirty-eight".