81140675266 has 32 divisors (see below), whose sum is σ = 147439491840. Its totient is φ = 32693692416.

The previous prime is 81140675263. The next prime is 81140675333. The reversal of 81140675266 is 66257604118.

It is not an unprimeable number, because it can be changed into a prime (81140675263) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 37611 + ... + 404593.

It is an arithmetic number, because the mean of its divisors is an integer number (4607484120).

Almost surely, 2^81140675266 is an apocalyptic number.

81140675266 is a deficient number, since it is larger than the sum of its proper divisors (66298816574).

81140675266 is a wasteful number, since it uses less digits than its factorization.

81140675266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367938.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 81140675266 in words is "eighty-one billion, one hundred forty million, six hundred seventy-five thousand, two hundred sixty-six".