81038071678 has 8 divisors (see below), whose sum is σ = 121559428368. Its totient is φ = 40518262224.

The previous prime is 81038071669. The next prime is 81038071679. The reversal of 81038071678 is 87617083018.

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

It is a super-2 number, since 2×81038071678² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81038071679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245551 + ... + 471562.

It is an arithmetic number, because the mean of its divisors is an integer number (15194928546).

Almost surely, 2^81038071678 is an apocalyptic number.

81038071678 is a deficient number, since it is larger than the sum of its proper divisors (40521356690).

81038071678 is a wasteful number, since it uses less digits than its factorization.

81038071678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773618.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 81038071678 in words is "eighty-one billion, thirty-eight million, seventy-one thousand, six hundred seventy-eight".