81186373316 has 24 divisors (see below), whose sum is σ = 143043907776. Its totient is φ = 40317084000.

The previous prime is 81186373259. The next prime is 81186373321. The reversal of 81186373316 is 61337368118.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777191 + ... + 875441.

It is an arithmetic number, because the mean of its divisors is an integer number (5960162824).

Almost surely, 2^81186373316 is an apocalyptic number.

It is an amenable number.

81186373316 is a deficient number, since it is larger than the sum of its proper divisors (61857534460).

81186373316 is a wasteful number, since it uses less digits than its factorization.

81186373316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99659 (or 99657 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The spelling of 81186373316 in words is "eighty-one billion, one hundred eighty-six million, three hundred seventy-three thousand, three hundred sixteen".