2566400797 has 4 divisors (see below), whose sum is σ = 2566512540. Its totient is φ = 2566289056.

The previous prime is 2566400783. The next prime is 2566400803. The reversal of 2566400797 is 7970046652.

2566400797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2304576036 + 261824761 = 48006^2 + 16181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2566400797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566400717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7408 + ... + 72025.

It is an arithmetic number, because the mean of its divisors is an integer number (641628135).

Almost surely, 2^2566400797 is an apocalyptic number.

It is an amenable number.

2566400797 is a deficient number, since it is larger than the sum of its proper divisors (111743).

2566400797 is an equidigital number, since it uses as much as digits as its factorization.

2566400797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111742.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 2566400797 is about 50659.6565029808. The cubic root of 2566400797 is about 1369.1199343639.

The spelling of 2566400797 in words is "two billion, five hundred sixty-six million, four hundred thousand, seven hundred ninety-seven".