13555278881 has 2 divisors, whose sum is σ = 13555278882. Its totient is φ = 13555278880.

The previous prime is 13555278791. The next prime is 13555278901. The reversal of 13555278881 is 18887255531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13543140625 + 12138256 = 116375^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 13555278881 - 2¹⁸ = 13555016737 is a prime.

It is a super-2 number, since 2×13555278881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13555277881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6777639440 + 6777639441.

It is an arithmetic number, because the mean of its divisors is an integer number (6777639441).

Almost surely, 2^13555278881 is an apocalyptic number.

It is an amenable number.

13555278881 is a deficient number, since it is larger than the sum of its proper divisors (1).

13555278881 is an equidigital number, since it uses as much as digits as its factorization.

13555278881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688000, while the sum is 53.

The spelling of 13555278881 in words is "thirteen billion, five hundred fifty-five million, two hundred seventy-eight thousand, eight hundred eighty-one".