81886683697 has 16 divisors (see below), whose sum is σ = 100802644992. Its totient is φ = 64777227840.

The previous prime is 81886683643. The next prime is 81886683709. The reversal of 81886683697 is 79638668818.

It is not a de Polignac number, because 81886683697 - 2¹¹ = 81886681649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81886683617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415623 + ... + 580099.

It is an arithmetic number, because the mean of its divisors is an integer number (6300165312).

Almost surely, 2^81886683697 is an apocalyptic number.

It is an amenable number.

81886683697 is a deficient number, since it is larger than the sum of its proper divisors (18915961295).

81886683697 is a wasteful number, since it uses less digits than its factorization.

81886683697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169968.

The product of its digits is 167215104, while the sum is 70.

The spelling of 81886683697 in words is "eighty-one billion, eight hundred eighty-six million, six hundred eighty-three thousand, six hundred ninety-seven".