194138518237 has 4 divisors (see below), whose sum is σ = 198269125056. Its totient is φ = 190007911420.

The previous prime is 194138518219. The next prime is 194138518253. The reversal of 194138518237 is 732815831491.

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.

It is a cyclic number.

It is not a de Polignac number, because 194138518237 - 2⁷ = 194138518109 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 (194138518267) 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, 2065303339 + ... + 2065303432.

It is an arithmetic number, because the mean of its divisors is an integer number (49567281264).

Almost surely, 2^194138518237 is an apocalyptic number.

It is an amenable number.

194138518237 is a deficient number, since it is larger than the sum of its proper divisors (4130606819).

194138518237 is an equidigital number, since it uses as much as digits as its factorization.

194138518237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130606818.

The product of its digits is 1451520, while the sum is 52.

The spelling of 194138518237 in words is "one hundred ninety-four billion, one hundred thirty-eight million, five hundred eighteen thousand, two hundred thirty-seven".