2556553650667 has 2 divisors, whose sum is σ = 2556553650668. Its totient is φ = 2556553650666.

The previous prime is 2556553650661. The next prime is 2556553650727. The reversal of 2556553650667 is 7660563556552.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2556553650667 - 2²³ = 2556545262059 is a prime.

It is not a weakly prime, because it can be changed into another prime (2556553650661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278276825333 + 1278276825334.

It is an arithmetic number, because the mean of its divisors is an integer number (1278276825334).

Almost surely, 2^{2556553650667} is an apocalyptic number.

2556553650667 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556553650667 is an equidigital number, since it uses as much as digits as its factorization.

2556553650667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100000, while the sum is 61.

The spelling of 2556553650667 in words is "two trillion, five hundred fifty-six billion, five hundred fifty-three million, six hundred fifty thousand, six hundred sixty-seven".