81362167559 has 2 divisors, whose sum is σ = 81362167560. Its totient is φ = 81362167558.

The previous prime is 81362167547. The next prime is 81362167567. The reversal of 81362167559 is 95576126318.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81362167559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81362167559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81362167459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40681083779 + 40681083780.

It is an arithmetic number, because the mean of its divisors is an integer number (40681083780).

Almost surely, 2^81362167559 is an apocalyptic number.

81362167559 is a deficient number, since it is larger than the sum of its proper divisors (1).

81362167559 is an equidigital number, since it uses as much as digits as its factorization.

81362167559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 53.

The spelling of 81362167559 in words is "eighty-one billion, three hundred sixty-two million, one hundred sixty-seven thousand, five hundred fifty-nine".