80661878046 has 96 divisors (see below), whose sum is σ = 186745847808. Its totient is φ = 25116557760.

The previous prime is 80661878029. The next prime is 80661878053. The reversal of 80661878046 is 64087816608.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 80661877983 and 80661878001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2606661 + ... + 2637423.

It is an arithmetic number, because the mean of its divisors is an integer number (1945269248).

Almost surely, 2^80661878046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80661878046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93372923904).

80661878046 is an abundant number, since it is smaller than the sum of its proper divisors (106083969762).

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

80661878046 is a wasteful number, since it uses less digits than its factorization.

80661878046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30966 (or 30963 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 80661878046 in words is "eighty billion, six hundred sixty-one million, eight hundred seventy-eight thousand, forty-six".