194872568381 has 4 divisors (see below), whose sum is σ = 194873731200. Its totient is φ = 194871405564.

The previous prime is 194872568353. The next prime is 194872568417. The reversal of 194872568381 is 183865278491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 183865278491 = 50753 ⋅3622747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194872568381 is a prime.

It is a super-2 number, since 2×194872568381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194872568081) 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, 276851 + ... + 682928.

It is an arithmetic number, because the mean of its divisors is an integer number (48718432800).

Almost surely, 2^194872568381 is an apocalyptic number.

It is an amenable number.

194872568381 is a deficient number, since it is larger than the sum of its proper divisors (1162819).

194872568381 is an equidigital number, since it uses as much as digits as its factorization.

194872568381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162818.

The product of its digits is 23224320, while the sum is 62.

The spelling of 194872568381 in words is "one hundred ninety-four billion, eight hundred seventy-two million, five hundred sixty-eight thousand, three hundred eighty-one".