71667519808 has 28 divisors (see below), whose sum is σ = 145683904212. Its totient is φ = 34959764480.

The previous prime is 71667519797. The next prime is 71667519821. The reversal of 71667519808 is 80891576617.

It can be written as a sum of positive squares in 2 ways, for example, as 7763724544 + 63903795264 = 88112^2 + 252792^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13653535 + ... + 13658782.

It is an arithmetic number, because the mean of its divisors is an integer number (5202996579).

Almost surely, 2^71667519808 is an apocalyptic number.

It is an amenable number.

71667519808 is an abundant number, since it is smaller than the sum of its proper divisors (74016384404).

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

71667519808 is a wasteful number, since it uses less digits than its factorization.

71667519808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27312370 (or 27312360 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 58.

The spelling of 71667519808 in words is "seventy-one billion, six hundred sixty-seven million, five hundred nineteen thousand, eight hundred eight".