71581782412 has 48 divisors (see below), whose sum is σ = 146705106240. Its totient is φ = 29919513600.

The previous prime is 71581782331. The next prime is 71581782431. The reversal of 71581782412 is 21428718517.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4056264 + ... + 4073872.

It is an arithmetic number, because the mean of its divisors is an integer number (3056356380).

Almost surely, 2^71581782412 is an apocalyptic number.

It is an amenable number.

71581782412 is an abundant number, since it is smaller than the sum of its proper divisors (75123323828).

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

71581782412 is a wasteful number, since it uses less digits than its factorization.

71581782412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21202 (or 21200 counting only the distinct ones).

The product of its digits is 250880, while the sum is 46.

The spelling of 71581782412 in words is "seventy-one billion, five hundred eighty-one million, seven hundred eighty-two thousand, four hundred twelve".