199473737479 has 4 divisors (see below), whose sum is σ = 200794755760. Its totient is φ = 198152719200.

The previous prime is 199473737453. The next prime is 199473737503. The reversal of 199473737479 is 974737374991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 974737374991 = 4327 ⋅225268633.

It is a cyclic number.

It is not a de Polignac number, because 199473737479 - 2⁵ = 199473737447 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 (199473737279) 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, 660508914 + ... + 660509215.

It is an arithmetic number, because the mean of its divisors is an integer number (50198688940).

Almost surely, 2^199473737479 is an apocalyptic number.

199473737479 is a deficient number, since it is larger than the sum of its proper divisors (1321018281).

199473737479 is a wasteful number, since it uses less digits than its factorization.

199473737479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321018280.

The product of its digits is 252047376, while the sum is 70.

The spelling of 199473737479 in words is "one hundred ninety-nine billion, four hundred seventy-three million, seven hundred thirty-seven thousand, four hundred seventy-nine".