194513776381 has 4 divisors (see below), whose sum is σ = 194560912512. Its totient is φ = 194466640252.

The previous prime is 194513776339. The next prime is 194513776417. The reversal of 194513776381 is 183677315491.

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 an emirpimes, since its reverse is a distinct semiprime: 183677315491 = 331 ⋅554916361.

It is a cyclic number.

It is not a de Polignac number, because 194513776381 - 2¹⁹ = 194513252093 is a prime.

It is a super-2 number, since 2×194513776381² (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 (194513776181) 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, 23561875 + ... + 23570128.

It is an arithmetic number, because the mean of its divisors is an integer number (48640228128).

Almost surely, 2^194513776381 is an apocalyptic number.

It is an amenable number.

194513776381 is a deficient number, since it is larger than the sum of its proper divisors (47136131).

194513776381 is an equidigital number, since it uses as much as digits as its factorization.

194513776381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47136130.

The product of its digits is 3810240, while the sum is 55.

The spelling of 194513776381 in words is "one hundred ninety-four billion, five hundred thirteen million, seven hundred seventy-six thousand, three hundred eighty-one".