85681566518658 has 16 divisors (see below), whose sum is σ = 186941599677216. Its totient is φ = 25964111066240.

The previous prime is 85681566518657. The next prime is 85681566518663.

85681566518658 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (85681566518657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 649102776591 + ... + 649102776722.

It is an arithmetic number, because the mean of its divisors is an integer number (11683849979826).

Almost surely, 2^{85681566518658} is an apocalyptic number.

85681566518658 is an abundant number, since it is smaller than the sum of its proper divisors (101260033158558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85681566518658 is a wasteful number, since it uses less digits than its factorization.

85681566518658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298205553329.

The product of its digits is 3317760000, while the sum is 78.

The spelling of 85681566518658 in words is "eighty-five trillion, six hundred eighty-one billion, five hundred sixty-six million, five hundred eighteen thousand, six hundred fifty-eight".