2591945972809 has 2 divisors, whose sum is σ = 2591945972810. Its totient is φ = 2591945972808.

The previous prime is 2591945972801. The next prime is 2591945972813. The reversal of 2591945972809 is 9082795491952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1306613597184 + 1285332375625 = 1143072^2 + 1133725^2 .

It is a cyclic number.

It is not a de Polignac number, because 2591945972809 - 2³ = 2591945972801 is a prime.

It is not a weakly prime, because it can be changed into another prime (2591945972801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1295972986404 + 1295972986405.

It is an arithmetic number, because the mean of its divisors is an integer number (1295972986405).

Almost surely, 2^{2591945972809} is an apocalyptic number.

It is an amenable number.

2591945972809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2591945972809 is an equidigital number, since it uses as much as digits as its factorization.

2591945972809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 146966400, while the sum is 70.

The spelling of 2591945972809 in words is "two trillion, five hundred ninety-one billion, nine hundred forty-five million, nine hundred seventy-two thousand, eight hundred nine".