81011226887 has 2 divisors, whose sum is σ = 81011226888. Its totient is φ = 81011226886.

The previous prime is 81011226883. The next prime is 81011226893. The reversal of 81011226887 is 78862211018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81011226887 - 2² = 81011226883 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81011226883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40505613443 + 40505613444.

It is an arithmetic number, because the mean of its divisors is an integer number (40505613444).

Almost surely, 2^81011226887 is an apocalyptic number.

81011226887 is a deficient number, since it is larger than the sum of its proper divisors (1).

81011226887 is an equidigital number, since it uses as much as digits as its factorization.

81011226887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 44.

The spelling of 81011226887 in words is "eighty-one billion, eleven million, two hundred twenty-six thousand, eight hundred eighty-seven".