185353828661 has 4 divisors (see below), whose sum is σ = 187264692972. Its totient is φ = 183442964352.

The previous prime is 185353828643. The next prime is 185353828679. The reversal of 185353828661 is 166828353581.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (185353828643) and next prime (185353828679).

It can be written as a sum of positive squares in 2 ways, for example, as 100378080625 + 84975748036 = 316825^2 + 291506^2 .

It is a cyclic number.

It is not a de Polignac number, because 185353828661 - 2¹⁴ = 185353812277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 185353828597 and 185353828606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185353828631) 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, 955432010 + ... + 955432203.

It is an arithmetic number, because the mean of its divisors is an integer number (46816173243).

Almost surely, 2^185353828661 is an apocalyptic number.

It is an amenable number.

185353828661 is a deficient number, since it is larger than the sum of its proper divisors (1910864311).

185353828661 is an equidigital number, since it uses as much as digits as its factorization.

185353828661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910864310.

The product of its digits is 8294400, while the sum is 56.

The spelling of 185353828661 in words is "one hundred eighty-five billion, three hundred fifty-three million, eight hundred twenty-eight thousand, six hundred sixty-one".