2551643867 has 2 divisors, whose sum is σ = 2551643868. Its totient is φ = 2551643866.

The previous prime is 2551643833. The next prime is 2551643903. The reversal of 2551643867 is 7683461552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2551643867 - 2¹² = 2551639771 is a prime.

It is not a weakly prime, because it can be changed into another prime (2551643767) 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, 1275821933 + 1275821934.

It is an arithmetic number, because the mean of its divisors is an integer number (1275821934).

Almost surely, 2^2551643867 is an apocalyptic number.

2551643867 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551643867 is an equidigital number, since it uses as much as digits as its factorization.

2551643867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 47.

The square root of 2551643867 is about 50513.7987781557. The cubic root of 2551643867 is about 1366.4907196918.

The spelling of 2551643867 in words is "two billion, five hundred fifty-one million, six hundred forty-three thousand, eight hundred sixty-seven".