81088790105 has 8 divisors (see below), whose sum is σ = 97950963264. Its totient is φ = 64441422000.

The previous prime is 81088790033. The next prime is 81088790143. The reversal of 81088790105 is 50109788018.

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

It is not a de Polignac number, because 81088790105 - 2¹⁶ = 81088724569 is a prime.

It is a super-2 number, since 2×81088790105² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81088790105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53700431 + ... + 53701940.

It is an arithmetic number, because the mean of its divisors is an integer number (12243870408).

Almost surely, 2^81088790105 is an apocalyptic number.

It is an amenable number.

81088790105 is a deficient number, since it is larger than the sum of its proper divisors (16862173159).

81088790105 is a wasteful number, since it uses less digits than its factorization.

81088790105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107402527.

The product of its (nonzero) digits is 161280, while the sum is 47.

The spelling of 81088790105 in words is "eighty-one billion, eighty-eight million, seven hundred ninety thousand, one hundred five".