81986572586 has 8 divisors (see below), whose sum is σ = 123322422240. Its totient is φ = 40879098508.

The previous prime is 81986572583. The next prime is 81986572601. The reversal of 81986572586 is 68527568918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81986572583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57092996 + ... + 57094431.

It is an arithmetic number, because the mean of its divisors is an integer number (15415302780).

Almost surely, 2^81986572586 is an apocalyptic number.

81986572586 is a deficient number, since it is larger than the sum of its proper divisors (41335849654).

81986572586 is a wasteful number, since it uses less digits than its factorization.

81986572586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114187788.

The product of its digits is 58060800, while the sum is 65.

The spelling of 81986572586 in words is "eighty-one billion, nine hundred eighty-six million, five hundred seventy-two thousand, five hundred eighty-six".