81362167541 has 2 divisors, whose sum is σ = 81362167542. Its totient is φ = 81362167540.

The previous prime is 81362167493. The next prime is 81362167547. The reversal of 81362167541 is 14576126318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77314026916 + 4048140625 = 278054^2 + 63625^2 .

It is a cyclic number.

It is not a de Polignac number, because 81362167541 - 2⁶ = 81362167477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81362167492 and 81362167501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81362167547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40681083770 + 40681083771.

It is an arithmetic number, because the mean of its divisors is an integer number (40681083771).

Almost surely, 2^81362167541 is an apocalyptic number.

It is an amenable number.

81362167541 is a deficient number, since it is larger than the sum of its proper divisors (1).

81362167541 is an equidigital number, since it uses as much as digits as its factorization.

81362167541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The spelling of 81362167541 in words is "eighty-one billion, three hundred sixty-two million, one hundred sixty-seven thousand, five hundred forty-one".