81600880080 has 40 divisors (see below), whose sum is σ = 252962728992. Its totient is φ = 21760234624.

The previous prime is 81600880051. The next prime is 81600880087. The reversal of 81600880080 is 8008800618.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (39) 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 (81600880087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170001594 + ... + 170002073.

Almost surely, 2^81600880080 is an apocalyptic number.

81600880080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81600880080 is an abundant number, since it is smaller than the sum of its proper divisors (171361848912).

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

81600880080 is a wasteful number, since it uses less digits than its factorization.

81600880080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340003683 (or 340003677 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 39.

The spelling of 81600880080 in words is "eighty-one billion, six hundred million, eight hundred eighty thousand, eighty".