80779109685690 has 128 divisors (see below), whose sum is σ = 211006934772480. Its totient is φ = 19672812859392.

The previous prime is 80779109685683. The next prime is 80779109685713. The reversal of 80779109685690 is 9658690197708.

It is a super-2 number, since 2×80779109685690² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27643234 + ... + 30425426.

It is an arithmetic number, because the mean of its divisors is an integer number (1648491677910).

Almost surely, 2^{80779109685690} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80779109685690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105503467386240).

80779109685690 is an abundant number, since it is smaller than the sum of its proper divisors (130227825086790).

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

80779109685690 is a wasteful number, since it uses less digits than its factorization.

80779109685690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783008.

The product of its (nonzero) digits is 411505920, while the sum is 75.

The spelling of 80779109685690 in words is "eighty trillion, seven hundred seventy-nine billion, one hundred nine million, six hundred eighty-five thousand, six hundred ninety".