199200723551 has 4 divisors (see below), whose sum is σ = 199632829704. Its totient is φ = 198768617400.

The previous prime is 199200723541. The next prime is 199200723559. The reversal of 199200723551 is 155327002991.

It is a happy number.

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 199200723551 - 2¹⁸ = 199200461407 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 (199200723559) 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, 216052385 + ... + 216053306.

It is an arithmetic number, because the mean of its divisors is an integer number (49908207426).

Almost surely, 2^199200723551 is an apocalyptic number.

199200723551 is a deficient number, since it is larger than the sum of its proper divisors (432106153).

199200723551 is an equidigital number, since it uses as much as digits as its factorization.

199200723551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432106152.

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 199200723551 in words is "one hundred ninety-nine billion, two hundred million, seven hundred twenty-three thousand, five hundred fifty-one".