71633396018 has 6 divisors (see below), whose sum is σ = 107450661789. Its totient is φ = 35816508756.

The previous prime is 71633395991. The next prime is 71633396053. The reversal of 71633396018 is 81069333617.

It can be written as a sum of positive squares in 2 ways, for example, as 49327077409 + 22306318609 = 222097^2 + 149353^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=189253.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 283880 + ... + 473132.

Almost surely, 2^71633396018 is an apocalyptic number.

71633396018 is a deficient number, since it is larger than the sum of its proper divisors (35817265771).

71633396018 is an frugal number, since it uses more digits than its factorization.

71633396018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378508 (or 189255 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 71633396018 in words is "seventy-one billion, six hundred thirty-three million, three hundred ninety-six thousand, eighteen".