81269799122 has 6 divisors (see below), whose sum is σ = 121905303429. Its totient is φ = 40634697980.

The previous prime is 81269799097. The next prime is 81269799133. The reversal of 81269799122 is 22199796218.

It can be written as a sum of positive squares in 2 ways, for example, as 75598052401 + 5671746721 = 274951^2 + 75311^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=201581.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 302372 + ... + 503952.

Almost surely, 2^81269799122 is an apocalyptic number.

81269799122 is a deficient number, since it is larger than the sum of its proper divisors (40635504307).

81269799122 is an frugal number, since it uses more digits than its factorization.

81269799122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403164 (or 201583 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 56.

The spelling of 81269799122 in words is "eighty-one billion, two hundred sixty-nine million, seven hundred ninety-nine thousand, one hundred twenty-two".