81037650858 has 8 divisors (see below), whose sum is σ = 162075301728. Its totient is φ = 27012550284.

The previous prime is 81037650847. The next prime is 81037650877. The reversal of 81037650858 is 85805673018.

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

81037650858 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81037650858.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6753137566 + ... + 6753137577.

It is an arithmetic number, because the mean of its divisors is an integer number (20259412716).

Almost surely, 2^81037650858 is an apocalyptic number.

81037650858 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81037650858 is a wasteful number, since it uses less digits than its factorization.

81037650858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13506275148.

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 81037650858 in words is "eighty-one billion, thirty-seven million, six hundred fifty thousand, eight hundred fifty-eight".