815861048111 has 2 divisors, whose sum is σ = 815861048112. Its totient is φ = 815861048110.

The previous prime is 815861048099. The next prime is 815861048113. The reversal of 815861048111 is 111840168518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 815861048111 - 2²² = 815856853807 is a prime.

Together with 815861048113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815861048113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407930524055 + 407930524056.

It is an arithmetic number, because the mean of its divisors is an integer number (407930524056).

Almost surely, 2^815861048111 is an apocalyptic number.

815861048111 is a deficient number, since it is larger than the sum of its proper divisors (1).

815861048111 is an equidigital number, since it uses as much as digits as its factorization.

815861048111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61440, while the sum is 44.

The spelling of 815861048111 in words is "eight hundred fifteen billion, eight hundred sixty-one million, forty-eight thousand, one hundred eleven".