186694767496681 has 4 divisors (see below), whose sum is σ = 186711476965252. Its totient is φ = 186678058028112.

The previous prime is 186694767496553. The next prime is 186694767496691.

186694767496681 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68159637133225 + 118535130363456 = 8255885^2 + 10887384^2 .

It is a cyclic number.

It is not a de Polignac number, because 186694767496681 - 2⁷ = 186694767496553 is a prime.

It is a super-2 number, since 2×186694767496681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 186694767496592 and 186694767496601.

It is not an unprimeable number, because it can be changed into a prime (186694767496691) 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 3 ways as a sum of consecutive naturals, for example, 8354717526 + ... + 8354739871.

It is an arithmetic number, because the mean of its divisors is an integer number (46677869241313).

Almost surely, 2^{186694767496681} is an apocalyptic number.

It is an amenable number.

186694767496681 is a deficient number, since it is larger than the sum of its proper divisors (16709468571).

186694767496681 is a wasteful number, since it uses less digits than its factorization.

186694767496681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16709468570.

The product of its digits is 31603654656, while the sum is 88.

The spelling of 186694767496681 in words is "one hundred eighty-six trillion, six hundred ninety-four billion, seven hundred sixty-seven million, four hundred ninety-six thousand, six hundred eighty-one".