81277813662 has 16 divisors (see below), whose sum is σ = 165622715280. Its totient is φ = 26581423232.

The previous prime is 81277813657. The next prime is 81277813663. The reversal of 81277813662 is 26631877218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81277813663) 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 7 ways as a sum of consecutive naturals, for example, 127794987 + ... + 127795622.

It is an arithmetic number, because the mean of its divisors is an integer number (10351419705).

Almost surely, 2^81277813662 is an apocalyptic number.

81277813662 is an abundant number, since it is smaller than the sum of its proper divisors (84344901618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81277813662 is a wasteful number, since it uses less digits than its factorization.

81277813662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255590667.

The product of its digits is 1354752, while the sum is 51.

The spelling of 81277813662 in words is "eighty-one billion, two hundred seventy-seven million, eight hundred thirteen thousand, six hundred sixty-two".