185426376163681 has 4 divisors (see below), whose sum is σ = 188466152822164. Its totient is φ = 182386599505200.

The previous prime is 185426376163621. The next prime is 185426376163723. The reversal of 185426376163681 is 186361673624581.

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 49465902240000 + 135960473923681 = 7033200^2 + 11660209^2 .

It is a cyclic number.

It is not a de Polignac number, because 185426376163681 - 2¹¹ = 185426376161633 is a prime.

It is a super-2 number, since 2×185426376163681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (185426376163621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1519888329150 + ... + 1519888329271.

It is an arithmetic number, because the mean of its divisors is an integer number (47116538205541).

Almost surely, 2^{185426376163681} is an apocalyptic number.

It is an amenable number.

185426376163681 is a deficient number, since it is larger than the sum of its proper divisors (3039776658483).

185426376163681 is an equidigital number, since it uses as much as digits as its factorization.

185426376163681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3039776658482.

The product of its digits is 209018880, while the sum is 67.

The spelling of 185426376163681 in words is "one hundred eighty-five trillion, four hundred twenty-six billion, three hundred seventy-six million, one hundred sixty-three thousand, six hundred eighty-one".