81414762782 has 4 divisors (see below), whose sum is σ = 122122144176. Its totient is φ = 40707381390.

The previous prime is 81414762773. The next prime is 81414762787. The reversal of 81414762782 is 28726741418.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81414762782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81414762787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20353690694 + ... + 20353690697.

It is an arithmetic number, because the mean of its divisors is an integer number (30530536044).

Almost surely, 2^81414762782 is an apocalyptic number.

81414762782 is a deficient number, since it is larger than the sum of its proper divisors (40707381394).

81414762782 is a wasteful number, since it uses less digits than its factorization.

81414762782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40707381393.

The product of its digits is 1204224, while the sum is 50.

The spelling of 81414762782 in words is "eighty-one billion, four hundred fourteen million, seven hundred sixty-two thousand, seven hundred eighty-two".