1188628025681 has 2 divisors, whose sum is σ = 1188628025682. Its totient is φ = 1188628025680.

The previous prime is 1188628025633. The next prime is 1188628025701. The reversal of 1188628025681 is 1865208268811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 805894016656 + 382734009025 = 897716^2 + 618655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188628025681 - 2³⁸ = 913750118737 is a prime.

It is a super-2 number, since 2×1188628025681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1184628025681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594314012840 + 594314012841.

It is an arithmetic number, because the mean of its divisors is an integer number (594314012841).

Almost surely, 2^{1188628025681} is an apocalyptic number.

It is an amenable number.

1188628025681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188628025681 is an equidigital number, since it uses as much as digits as its factorization.

1188628025681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2949120, while the sum is 56.

The spelling of 1188628025681 in words is "one trillion, one hundred eighty-eight billion, six hundred twenty-eight million, twenty-five thousand, six hundred eighty-one".