81880472266 has 8 divisors (see below), whose sum is σ = 123047735364. Its totient is φ = 40864560480.

The previous prime is 81880472221. The next prime is 81880472281. The reversal of 81880472266 is 66227408818.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75210320025 + 6670152241 = 274245^2 + 81671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37836475 + ... + 37838638.

Almost surely, 2^81880472266 is an apocalyptic number.

81880472266 is a deficient number, since it is larger than the sum of its proper divisors (41167263098).

81880472266 is a wasteful number, since it uses less digits than its factorization.

81880472266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75675656.

The product of its (nonzero) digits is 2064384, while the sum is 52.

The spelling of 81880472266 in words is "eighty-one billion, eight hundred eighty million, four hundred seventy-two thousand, two hundred sixty-six".