81776255266 has 16 divisors (see below), whose sum is σ = 125065959480. Its totient is φ = 40095336960.

The previous prime is 81776255233. The next prime is 81776255279. The reversal of 81776255266 is 66255267718.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54445222225 + 27331033041 = 233335^2 + 165321^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1912465 + ... + 1954756.

Almost surely, 2^81776255266 is an apocalyptic number.

81776255266 is a deficient number, since it is larger than the sum of its proper divisors (43289704214).

81776255266 is a wasteful number, since it uses less digits than its factorization.

81776255266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3867429.

The product of its digits is 8467200, while the sum is 55.

The spelling of 81776255266 in words is "eighty-one billion, seven hundred seventy-six million, two hundred fifty-five thousand, two hundred sixty-six".