194991655828 has 12 divisors (see below), whose sum is σ = 341716693780. Its totient is φ = 97358314752.

The previous prime is 194991655823. The next prime is 194991655849. The reversal of 194991655828 is 828556199491.

It can be written as a sum of positive squares in 2 ways, for example, as 54817793424 + 140173862404 = 234132^2 + 374398^2 .

It is a hoax number, since the sum of its digits (67) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194991655823) 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, 34375101 + ... + 34380772.

Almost surely, 2^194991655828 is an apocalyptic number.

It is an amenable number.

194991655828 is a deficient number, since it is larger than the sum of its proper divisors (146725037952).

194991655828 is a wasteful number, since it uses less digits than its factorization.

194991655828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68756586 (or 68756584 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 67.

The spelling of 194991655828 in words is "one hundred ninety-four billion, nine hundred ninety-one million, six hundred fifty-five thousand, eight hundred twenty-eight".