2566788667 has 2 divisors, whose sum is σ = 2566788668. Its totient is φ = 2566788666.

The previous prime is 2566788619. The next prime is 2566788671. The reversal of 2566788667 is 7668876652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2566788667 is a prime.

It is a super-2 number, since 2×2566788667² = 13176808122079273778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2566788617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283394333 + 1283394334.

It is an arithmetic number, because the mean of its divisors is an integer number (1283394334).

Almost surely, 2^2566788667 is an apocalyptic number.

2566788667 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566788667 is an equidigital number, since it uses as much as digits as its factorization.

2566788667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40642560, while the sum is 61.

The square root of 2566788667 is about 50663.4845524861. The cubic root of 2566788667 is about 1369.1889043392.

The spelling of 2566788667 in words is "two billion, five hundred sixty-six million, seven hundred eighty-eight thousand, six hundred sixty-seven".