81059180658 has 8 divisors (see below), whose sum is σ = 162118361328. Its totient is φ = 27019726884.

The previous prime is 81059180641. The next prime is 81059180677. The reversal of 81059180658 is 85608195018.

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

81059180658 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 81059180658.

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, 6754931716 + ... + 6754931727.

It is an arithmetic number, because the mean of its divisors is an integer number (20264795166).

Almost surely, 2^81059180658 is an apocalyptic number.

81059180658 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.

81059180658 is a wasteful number, since it uses less digits than its factorization.

81059180658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13509863448.

The product of its (nonzero) digits is 691200, while the sum is 51.

The spelling of 81059180658 in words is "eighty-one billion, fifty-nine million, one hundred eighty thousand, six hundred fifty-eight".