2645472972809 has 2 divisors, whose sum is σ = 2645472972810. Its totient is φ = 2645472972808.

The previous prime is 2645472972797. The next prime is 2645472972839. The reversal of 2645472972809 is 9082792745462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2642565606409 + 2907366400 = 1625597^2 + 53920^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645472972809 - 2¹² = 2645472968713 is a prime.

It is not a weakly prime, because it can be changed into another prime (2645472972839) 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, 1322736486404 + 1322736486405.

It is an arithmetic number, because the mean of its divisors is an integer number (1322736486405).

Almost surely, 2^{2645472972809} is an apocalyptic number.

It is an amenable number.

2645472972809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645472972809 is an equidigital number, since it uses as much as digits as its factorization.

2645472972809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121927680, while the sum is 65.

The spelling of 2645472972809 in words is "two trillion, six hundred forty-five billion, four hundred seventy-two million, nine hundred seventy-two thousand, eight hundred nine".