81703953886 has 4 divisors (see below), whose sum is σ = 122555930832. Its totient is φ = 40851976942.

The previous prime is 81703953857. The next prime is 81703953907. The reversal of 81703953886 is 68835930718.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×81703953886² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 81703953886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20425988470 + ... + 20425988473.

It is an arithmetic number, because the mean of its divisors is an integer number (30638982708).

Almost surely, 2^81703953886 is an apocalyptic number.

81703953886 is a deficient number, since it is larger than the sum of its proper divisors (40851976946).

81703953886 is a wasteful number, since it uses less digits than its factorization.

81703953886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40851976945.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 81703953886 in words is "eighty-one billion, seven hundred three million, nine hundred fifty-three thousand, eight hundred eighty-six".