194644381115 has 4 divisors (see below), whose sum is σ = 233573257344. Its totient is φ = 155715504888.

The previous prime is 194644381097. The next prime is 194644381121. The reversal of 194644381115 is 511183446491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511183446491 = 36263 ⋅14096557.

It is a cyclic number.

It is not a de Polignac number, because 194644381115 - 2⁶ = 194644381051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194644381115.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19464438107 + ... + 19464438116.

It is an arithmetic number, because the mean of its divisors is an integer number (58393314336).

Almost surely, 2^194644381115 is an apocalyptic number.

194644381115 is a deficient number, since it is larger than the sum of its proper divisors (38928876229).

194644381115 is an equidigital number, since it uses as much as digits as its factorization.

194644381115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38928876228.

The product of its digits is 414720, while the sum is 47.

The spelling of 194644381115 in words is "one hundred ninety-four billion, six hundred forty-four million, three hundred eighty-one thousand, one hundred fifteen".