201381664 has 24 divisors (see below), whose sum is σ = 432513648. Its totient is φ = 91536960.

The previous prime is 201381647. The next prime is 201381701. The reversal of 201381664 is 466183102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285702 + ... + 286405.

It is an arithmetic number, because the mean of its divisors is an integer number (18021402).

Almost surely, 2^201381664 is an apocalyptic number.

It is an amenable number.

201381664 is an abundant number, since it is smaller than the sum of its proper divisors (231131984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201381664 is a wasteful number, since it uses less digits than its factorization.

201381664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572128 (or 572120 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 201381664 is about 14190.9007466052. The cubic root of 201381664 is about 586.1471284288.

The spelling of 201381664 in words is "two hundred one million, three hundred eighty-one thousand, six hundred sixty-four".