81588566212 has 12 divisors (see below), whose sum is σ = 142924074496. Its totient is φ = 40753116360.

The previous prime is 81588566203. The next prime is 81588566221. The reversal of 81588566212 is 21266588518.

It is an interprime number because it is at equal distance from previous prime (81588566203) and next prime (81588566221).

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81588566212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10287228 + ... + 10295155.

Almost surely, 2^81588566212 is an apocalyptic number.

It is an amenable number.

81588566212 is a deficient number, since it is larger than the sum of its proper divisors (61335508284).

81588566212 is a wasteful number, since it uses less digits than its factorization.

81588566212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20583378 (or 20583376 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 52.

The spelling of 81588566212 in words is "eighty-one billion, five hundred eighty-eight million, five hundred sixty-six thousand, two hundred twelve".