80681786640 has 800 divisors, whose sum is σ = 350696054016. Its totient is φ = 16736440320.

The previous prime is 80681786629. The next prime is 80681786683. The reversal of 80681786640 is 4668718608.

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

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 35969359 + ... + 35971601.

Almost surely, 2^80681786640 is an apocalyptic number.

80681786640 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 80681786640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175348027008).

80681786640 is an abundant number, since it is smaller than the sum of its proper divisors (270014267376).

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

80681786640 is a wasteful number, since it uses less digits than its factorization.

80681786640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349 (or 2334 counting only the distinct ones).

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

The spelling of 80681786640 in words is "eighty billion, six hundred eighty-one million, seven hundred eighty-six thousand, six hundred forty".