199743752146 has 4 divisors (see below), whose sum is σ = 299615628222. Its totient is φ = 99871876072.

The previous prime is 199743752141. The next prime is 199743752179. The reversal of 199743752146 is 641257347991.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 105307389121 + 94436363025 = 324511^2 + 307305^2 .

It is not an unprimeable number, because it can be changed into a prime (199743752141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49935938035 + ... + 49935938038.

Almost surely, 2^199743752146 is an apocalyptic number.

199743752146 is a deficient number, since it is larger than the sum of its proper divisors (99871876076).

199743752146 is an equidigital number, since it uses as much as digits as its factorization.

199743752146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99871876075.

The product of its digits is 11430720, while the sum is 58.

The spelling of 199743752146 in words is "one hundred ninety-nine billion, seven hundred forty-three million, seven hundred fifty-two thousand, one hundred forty-six".