194720851947 has 4 divisors (see below), whose sum is σ = 259627802600. Its totient is φ = 129813901296.

The previous prime is 194720851933. The next prime is 194720851951. The reversal of 194720851947 is 749158027491.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 194720851947 - 2²⁰ = 194719803371 is a prime.

It is a super-3 number, since 3×194720851947³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194720851907) 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, 32453475322 + ... + 32453475327.

It is an arithmetic number, because the mean of its divisors is an integer number (64906950650).

Almost surely, 2^194720851947 is an apocalyptic number.

194720851947 is a deficient number, since it is larger than the sum of its proper divisors (64906950653).

194720851947 is an equidigital number, since it uses as much as digits as its factorization.

194720851947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64906950652.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 194720851947 in words is "one hundred ninety-four billion, seven hundred twenty million, eight hundred fifty-one thousand, nine hundred forty-seven".