194638653823 has 4 divisors (see below), whose sum is σ = 194644302048. Its totient is φ = 194633005600.

The previous prime is 194638653763. The next prime is 194638653857. The reversal of 194638653823 is 328356836491.

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

It is a cyclic number.

It is not a de Polignac number, because 194638653823 - 2²¹ = 194636556671 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 (194638653023) 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, 2772103 + ... + 2841448.

It is an arithmetic number, because the mean of its divisors is an integer number (48661075512).

Almost surely, 2^194638653823 is an apocalyptic number.

194638653823 is a deficient number, since it is larger than the sum of its proper divisors (5648225).

194638653823 is an equidigital number, since it uses as much as digits as its factorization.

194638653823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5648224.

The product of its digits is 22394880, while the sum is 58.

The spelling of 194638653823 in words is "one hundred ninety-four billion, six hundred thirty-eight million, six hundred fifty-three thousand, eight hundred twenty-three".