203991998723 has 4 divisors (see below), whose sum is σ = 208967413368. Its totient is φ = 199016584080.

The previous prime is 203991998701. The next prime is 203991998741. The reversal of 203991998723 is 327899199302.

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 203991998723 - 2²⁰ = 203990950147 is a prime.

It is a super-2 number, since 2×203991998723² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203991998123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2487707261 + ... + 2487707342.

It is an arithmetic number, because the mean of its divisors is an integer number (52241853342).

Almost surely, 2^203991998723 is an apocalyptic number.

203991998723 is a deficient number, since it is larger than the sum of its proper divisors (4975414645).

203991998723 is an equidigital number, since it uses as much as digits as its factorization.

203991998723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975414644.

The product of its (nonzero) digits is 13226976, while the sum is 62.

The spelling of 203991998723 in words is "two hundred three billion, nine hundred ninety-one million, nine hundred ninety-eight thousand, seven hundred twenty-three".