80216664516 has 72 divisors (see below), whose sum is σ = 207302298840. Its totient is φ = 26144661504.

The previous prime is 80216664503. The next prime is 80216664553. The reversal of 80216664516 is 61546661208.

It can be written as a sum of positive squares in 4 ways, for example, as 34783742016 + 45432922500 = 186504^2 + 213150^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 487300 + ... + 630788.

It is an arithmetic number, because the mean of its divisors is an integer number (2879198595).

Almost surely, 2^80216664516 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 80216664516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103651149420).

80216664516 is an abundant number, since it is smaller than the sum of its proper divisors (127085634324).

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

80216664516 is a wasteful number, since it uses less digits than its factorization.

80216664516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143845 (or 143840 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 80216664516 in words is "eighty billion, two hundred sixteen million, six hundred sixty-four thousand, five hundred sixteen".