194663681001 has 28 divisors (see below), whose sum is σ = 291944392192. Its totient is φ = 129739156056.

The previous prime is 194663680961. The next prime is 194663681029. The reversal of 194663681001 is 100186366491.

194663681001 is a `hidden beast` number, since 1 + 9 + 4 + 6 + 636 + 8 + 1 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 194663681001 - 2⁷ = 194663680873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194663681071) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2681160 + ... + 2752806.

Almost surely, 2^194663681001 is an apocalyptic number.

It is an amenable number.

194663681001 is a deficient number, since it is larger than the sum of its proper divisors (97280711191).

194663681001 is an frugal number, since it uses more digits than its factorization.

194663681001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75392 (or 75377 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 194663681001 in words is "one hundred ninety-four billion, six hundred sixty-three million, six hundred eighty-one thousand, one".