185121394856 has 16 divisors (see below), whose sum is σ = 348392963700. Its totient is φ = 92216604544.

The previous prime is 185121394849. The next prime is 185121394859. The reversal of 185121394856 is 658493121581.

It can be written as a sum of positive squares in 2 ways, for example, as 145626192100 + 39495202756 = 381610^2 + 198734^2 .

It is a junction number, because it is equal to n+sod(n) for n = 185121394798 and 185121394807.

It is not an unprimeable number, because it can be changed into a prime (185121394859) 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, 43009325 + ... + 43013628.

Almost surely, 2^185121394856 is an apocalyptic number.

It is an amenable number.

185121394856 is a deficient number, since it is larger than the sum of its proper divisors (163271568844).

185121394856 is a wasteful number, since it uses less digits than its factorization.

185121394856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86023228 (or 86023224 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 53.

The spelling of 185121394856 in words is "one hundred eighty-five billion, one hundred twenty-one million, three hundred ninety-four thousand, eight hundred fifty-six".