194856913477 has 16 divisors (see below), whose sum is σ = 213660860400. Its totient is φ = 176882191360.

The previous prime is 194856913463. The next prime is 194856913483. The reversal of 194856913477 is 774319658491.

It is a Cunningham number, because it is equal to 441426²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 194856913476 = 1^2 + 441426^2 .

It is a cyclic number.

It is not a de Polignac number, because 194856913477 - 2²³ = 194848524869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194856913417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253899 + ... + 673927.

It is an arithmetic number, because the mean of its divisors is an integer number (13353803775).

Almost surely, 2^194856913477 is an apocalyptic number.

194856913477 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

194856913477 is a deficient number, since it is larger than the sum of its proper divisors (18803946923).

194856913477 is a wasteful number, since it uses less digits than its factorization.

194856913477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421016.

The product of its digits is 45722880, while the sum is 64.

The spelling of 194856913477 in words is "one hundred ninety-four billion, eight hundred fifty-six million, nine hundred thirteen thousand, four hundred seventy-seven".