199439418523 has 4 divisors (see below), whose sum is σ = 200895180840. Its totient is φ = 197983656208.

The previous prime is 199439418509. The next prime is 199439418539. The reversal of 199439418523 is 325814934991.

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

It is a cyclic number.

It is not a de Polignac number, because 199439418523 - 2²⁹ = 198902547611 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199469418523) 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, 727880953 + ... + 727881226.

It is an arithmetic number, because the mean of its divisors is an integer number (50223795210).

Almost surely, 2^199439418523 is an apocalyptic number.

199439418523 is a deficient number, since it is larger than the sum of its proper divisors (1455762317).

199439418523 is a wasteful number, since it uses less digits than its factorization.

199439418523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455762316.

The product of its digits is 8398080, while the sum is 58.

The spelling of 199439418523 in words is "one hundred ninety-nine billion, four hundred thirty-nine million, four hundred eighteen thousand, five hundred twenty-three".