186686938646 has 16 divisors (see below), whose sum is σ = 303421345584. Its totient is φ = 85634591904.

The previous prime is 186686938643. The next prime is 186686938651. The reversal of 186686938646 is 646839686681.

It is a super-2 number, since 2×186686938646² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 186686938646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (186686938643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22021121 + ... + 22029596.

It is an arithmetic number, because the mean of its divisors is an integer number (18963834099).

Almost surely, 2^186686938646 is an apocalyptic number.

186686938646 is a deficient number, since it is larger than the sum of its proper divisors (116734406938).

186686938646 is a wasteful number, since it uses less digits than its factorization.

186686938646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44050895.

The product of its digits is 429981696, while the sum is 71.

The spelling of 186686938646 in words is "one hundred eighty-six billion, six hundred eighty-six million, nine hundred thirty-eight thousand, six hundred forty-six".