81614345280 has 672 divisors, whose sum is σ = 300721434624. Its totient is φ = 18678546432.

The previous prime is 81614345273. The next prime is 81614345299. The reversal of 81614345280 is 8254341618.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 350276044 + ... + 350276276.

Almost surely, 2^81614345280 is an apocalyptic number.

81614345280 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 81614345280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150360717312).

81614345280 is an abundant number, since it is smaller than the sum of its proper divisors (219107089344).

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

81614345280 is a wasteful number, since it uses less digits than its factorization.

81614345280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

Adding to 81614345280 its reverse (8254341618), we get a palindrome (89868686898).

The spelling of 81614345280 in words is "eighty-one billion, six hundred fourteen million, three hundred forty-five thousand, two hundred eighty".