81018808678 has 16 divisors (see below), whose sum is σ = 122346673200. Its totient is φ = 40236880896.

The previous prime is 81018808643. The next prime is 81018808681. The reversal of 81018808678 is 87680881018.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 479998 + ... + 626446.

It is an arithmetic number, because the mean of its divisors is an integer number (7646667075).

Almost surely, 2^81018808678 is an apocalyptic number.

81018808678 is a deficient number, since it is larger than the sum of its proper divisors (41327864522).

81018808678 is a wasteful number, since it uses less digits than its factorization.

81018808678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148311.

The product of its (nonzero) digits is 1376256, while the sum is 55.

The spelling of 81018808678 in words is "eighty-one billion, eighteen million, eight hundred eight thousand, six hundred seventy-eight".