80961805980 has 144 divisors (see below), whose sum is σ = 268000596864. Its totient is φ = 19620466560.

The previous prime is 80961805963. The next prime is 80961805987. The reversal of 80961805980 is 8950816908.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80961805987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8475567 + ... + 8485113.

It is an arithmetic number, because the mean of its divisors is an integer number (1861115256).

Almost surely, 2^80961805980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80961805980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134000298432).

80961805980 is an abundant number, since it is smaller than the sum of its proper divisors (187038790884).

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

80961805980 is a wasteful number, since it uses less digits than its factorization.

80961805980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13856 (or 13851 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 80961805980 in words is "eighty billion, nine hundred sixty-one million, eight hundred five thousand, nine hundred eighty".