81098870779 has 8 divisors (see below), whose sum is σ = 81822169440. Its totient is φ = 80378697216.

The previous prime is 81098870771. The next prime is 81098870819. The reversal of 81098870779 is 97707889018.

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

It is a cyclic number.

It is not a de Polignac number, because 81098870779 - 2³ = 81098870771 is a prime.

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 81098870779.

It is not an unprimeable number, because it can be changed into a prime (81098870771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729127 + ... + 832960.

It is an arithmetic number, because the mean of its divisors is an integer number (10227771180).

Almost surely, 2^81098870779 is an apocalyptic number.

81098870779 is a deficient number, since it is larger than the sum of its proper divisors (723298661).

81098870779 is a wasteful number, since it uses less digits than its factorization.

81098870779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562549.

The product of its (nonzero) digits is 14224896, while the sum is 64.

The spelling of 81098870779 in words is "eighty-one billion, ninety-eight million, eight hundred seventy thousand, seven hundred seventy-nine".