201664877 has 2 divisors, whose sum is σ = 201664878. Its totient is φ = 201664876.

The previous prime is 201664873. The next prime is 201664901. The reversal of 201664877 is 778466102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137968516 + 63696361 = 11746^2 + 7981^2 .

It is a cyclic number.

It is not a de Polignac number, because 201664877 - 2² = 201664873 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201664871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100832438 + 100832439.

It is an arithmetic number, because the mean of its divisors is an integer number (100832439).

Almost surely, 2^201664877 is an apocalyptic number.

It is an amenable number.

201664877 is a deficient number, since it is larger than the sum of its proper divisors (1).

201664877 is an equidigital number, since it uses as much as digits as its factorization.

201664877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 201664877 is about 14200.8759236887. The cubic root of 201664877 is about 586.4217756236.

The spelling of 201664877 in words is "two hundred one million, six hundred sixty-four thousand, eight hundred seventy-seven".