80661097440 has 864 divisors, whose sum is σ = 354429286848. Its totient is φ = 16341811200.

The previous prime is 80661097421. The next prime is 80661097441. The reversal of 80661097440 is 4479016608.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80661097441) by changing a digit.

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 143 ways as a sum of consecutive naturals, for example, 50006074 + ... + 50007686.

It is an arithmetic number, because the mean of its divisors is an integer number (410219082).

Almost surely, 2^80661097440 is an apocalyptic number.

80661097440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80661097440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177214643424).

80661097440 is an abundant number, since it is smaller than the sum of its proper divisors (273768189408).

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

80661097440 is a wasteful number, since it uses less digits than its factorization.

80661097440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704 (or 1682 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 80661097440 in words is "eighty billion, six hundred sixty-one million, ninety-seven thousand, four hundred forty".