16204020451 has 4 divisors (see below), whose sum is σ = 16599240504. Its totient is φ = 15808800400.

The previous prime is 16204020449. The next prime is 16204020491. The reversal of 16204020451 is 15402040261.

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 16204020451 - 2¹ = 16204020449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16204020431) 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, 197609965 + ... + 197610046.

It is an arithmetic number, because the mean of its divisors is an integer number (4149810126).

Almost surely, 2^16204020451 is an apocalyptic number.

16204020451 is a deficient number, since it is larger than the sum of its proper divisors (395220053).

16204020451 is an equidigital number, since it uses as much as digits as its factorization.

16204020451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395220052.

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 16204020451 in words is "sixteen billion, two hundred four million, twenty thousand, four hundred fifty-one".