11551228481791 has 2 divisors, whose sum is σ = 11551228481792. Its totient is φ = 11551228481790.

The previous prime is 11551228481783. The next prime is 11551228481809. The reversal of 11551228481791 is 19718482215511.

It is a weak prime.

It is an emirp because it is prime and its reverse (19718482215511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11551228481791 - 2³ = 11551228481783 is a prime.

It is a super-2 number, since 2×11551228481791² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11551228481701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775614240895 + 5775614240896.

It is an arithmetic number, because the mean of its divisors is an integer number (5775614240896).

Almost surely, 2^{11551228481791} is an apocalyptic number.

11551228481791 is a deficient number, since it is larger than the sum of its proper divisors (1).

11551228481791 is an equidigital number, since it uses as much as digits as its factorization.

11551228481791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1612800, while the sum is 55.

The spelling of 11551228481791 in words is "eleven trillion, five hundred fifty-one billion, two hundred twenty-eight million, four hundred eighty-one thousand, seven hundred ninety-one".