1255550199991 has 2 divisors, whose sum is σ = 1255550199992. Its totient is φ = 1255550199990.

The previous prime is 1255550199977. The next prime is 1255550200019. The reversal of 1255550199991 is 1999910555521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1255550199991 - 2²¹ = 1255548102839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255530199991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627775099995 + 627775099996.

It is an arithmetic number, because the mean of its divisors is an integer number (627775099996).

Almost surely, 2^{1255550199991} is an apocalyptic number.

1255550199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255550199991 is an equidigital number, since it uses as much as digits as its factorization.

1255550199991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8201250, while the sum is 61.

It can be divided in two parts, 1255550 and 199991, that added together give a palindrome (1455541).

The spelling of 1255550199991 in words is "one trillion, two hundred fifty-five billion, five hundred fifty million, one hundred ninety-nine thousand, nine hundred ninety-one".