2551738643 has 2 divisors, whose sum is σ = 2551738644. Its totient is φ = 2551738642.

The previous prime is 2551738621. The next prime is 2551738661. The reversal of 2551738643 is 3468371552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2551738643 is a prime.

It is a super-2 number, since 2×2551738643² = 13022740204358962898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2551738594 and 2551738603.

It is not a weakly prime, because it can be changed into another prime (2551738603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275869321 + 1275869322.

It is an arithmetic number, because the mean of its divisors is an integer number (1275869322).

Almost surely, 2^2551738643 is an apocalyptic number.

2551738643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551738643 is an equidigital number, since it uses as much as digits as its factorization.

2551738643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 44.

The square root of 2551738643 is about 50514.7368893474. The cubic root of 2551738643 is about 1366.5076380560.

The spelling of 2551738643 in words is "two billion, five hundred fifty-one million, seven hundred thirty-eight thousand, six hundred forty-three".