2551716787 has 2 divisors, whose sum is σ = 2551716788. Its totient is φ = 2551716786.

The previous prime is 2551716737. The next prime is 2551716799. The reversal of 2551716787 is 7876171552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2551716787 - 2¹⁵ = 2551684019 is a prime.

It is a super-2 number, since 2×2551716787² = 13022517122115206738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2551716787.

It is not a weakly prime, because it can be changed into another prime (2551716737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275858393 + 1275858394.

It is an arithmetic number, because the mean of its divisors is an integer number (1275858394).

Almost surely, 2^2551716787 is an apocalyptic number.

2551716787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551716787 is an equidigital number, since it uses as much as digits as its factorization.

2551716787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 823200, while the sum is 49.

The square root of 2551716787 is about 50514.5205559748. The cubic root of 2551716787 is about 1366.5037366016.

The spelling of 2551716787 in words is "two billion, five hundred fifty-one million, seven hundred sixteen thousand, seven hundred eighty-seven".