2001566797 has 2 divisors, whose sum is σ = 2001566798. Its totient is φ = 2001566796.

The previous prime is 2001566767. The next prime is 2001566803. The reversal of 2001566797 is 7976651002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1258404676 + 743162121 = 35474^2 + 27261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001566797 - 2⁷ = 2001566669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001566767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000783398 + 1000783399.

It is an arithmetic number, because the mean of its divisors is an integer number (1000783399).

Almost surely, 2^2001566797 is an apocalyptic number.

It is an amenable number.

2001566797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001566797 is an equidigital number, since it uses as much as digits as its factorization.

2001566797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 2001566797 is about 44738.8734435725. The cubic root of 2001566797 is about 1260.2499707713.

The spelling of 2001566797 in words is "two billion, one million, five hundred sixty-six thousand, seven hundred ninety-seven".