2564343851 has 2 divisors, whose sum is σ = 2564343852. Its totient is φ = 2564343850.

The previous prime is 2564343841. The next prime is 2564343877. The reversal of 2564343851 is 1583434652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2564343851 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 2564343799 and 2564343808.

It is not a weakly prime, because it can be changed into another prime (2564343841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282171925 + 1282171926.

It is an arithmetic number, because the mean of its divisors is an integer number (1282171926).

Almost surely, 2^2564343851 is an apocalyptic number.

2564343851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2564343851 is an equidigital number, since it uses as much as digits as its factorization.

2564343851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 41.

The square root of 2564343851 is about 50639.3508153491. The cubic root of 2564343851 is about 1368.7540576987.

The spelling of 2564343851 in words is "two billion, five hundred sixty-four million, three hundred forty-three thousand, eight hundred fifty-one".