194988637871 has 8 divisors (see below), whose sum is σ = 198742193664. Its totient is φ = 191270661120.

The previous prime is 194988637861. The next prime is 194988637897. The reversal of 194988637871 is 178736889491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 194988637871 - 2²⁶ = 194921529007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 194988637795 and 194988637804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194988637861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8883695 + ... + 8905616.

It is an arithmetic number, because the mean of its divisors is an integer number (24842774208).

Almost surely, 2^194988637871 is an apocalyptic number.

194988637871 is a deficient number, since it is larger than the sum of its proper divisors (3753555793).

194988637871 is a wasteful number, since it uses less digits than its factorization.

194988637871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17789521.

The product of its digits is 146313216, while the sum is 71.

The spelling of 194988637871 in words is "one hundred ninety-four billion, nine hundred eighty-eight million, six hundred thirty-seven thousand, eight hundred seventy-one".