201664970 has 16 divisors (see below), whose sum is σ = 390920040. Its totient is φ = 74460864.

The previous prime is 201664907. The next prime is 201664973. The reversal of 201664970 is 79466102.

It can be written as a sum of positive squares in 4 ways, for example, as 92525161 + 109139809 = 9619^2 + 10447^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 201664970.

It is not an unprimeable number, because it can be changed into a prime (201664973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775505 + ... + 775764.

Almost surely, 2^201664970 is an apocalyptic number.

201664970 is a deficient number, since it is larger than the sum of its proper divisors (189255070).

201664970 is a wasteful number, since it uses less digits than its factorization.

201664970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551289.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 201664970 is about 14200.8791981342. The cubic root of 201664970 is about 586.4218657686.

The spelling of 201664970 in words is "two hundred one million, six hundred sixty-four thousand, nine hundred seventy".