81412746269 has 2 divisors, whose sum is σ = 81412746270. Its totient is φ = 81412746268.

The previous prime is 81412746161. The next prime is 81412746307. The reversal of 81412746269 is 96264721418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77165617369 + 4247128900 = 277787^2 + 65170^2 .

It is a cyclic number.

It is not a de Polignac number, because 81412746269 - 2²⁰ = 81411697693 is a prime.

It is a super-2 number, since 2×81412746269² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81412746769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40706373134 + 40706373135.

It is an arithmetic number, because the mean of its divisors is an integer number (40706373135).

Almost surely, 2^81412746269 is an apocalyptic number.

It is an amenable number.

81412746269 is a deficient number, since it is larger than the sum of its proper divisors (1).

81412746269 is an equidigital number, since it uses as much as digits as its factorization.

81412746269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The spelling of 81412746269 in words is "eighty-one billion, four hundred twelve million, seven hundred forty-six thousand, two hundred sixty-nine".