2001566201 has 2 divisors, whose sum is σ = 2001566202. Its totient is φ = 2001566200.

The previous prime is 2001566141. The next prime is 2001566207. The reversal of 2001566201 is 1026651002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1683871225 + 317694976 = 41035^2 + 17824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001566201 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001566207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000783100 + 1000783101.

It is an arithmetic number, because the mean of its divisors is an integer number (1000783101).

Almost surely, 2^2001566201 is an apocalyptic number.

It is an amenable number.

2001566201 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001566201 is an equidigital number, since it uses as much as digits as its factorization.

2001566201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2001566201 is about 44738.8667826980. The cubic root of 2001566201 is about 1260.2498456845.

The spelling of 2001566201 in words is "two billion, one million, five hundred sixty-six thousand, two hundred one".