16420551433499 has 4 divisors (see below), whose sum is σ = 16420703948880. Its totient is φ = 16420398918120.

The previous prime is 16420551433487. The next prime is 16420551433651. The reversal of 16420551433499 is 99433415502461.

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 16420551433499 - 2²⁰ = 16420550384923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16420551433439) 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, 76096079 + ... + 76311560.

It is an arithmetic number, because the mean of its divisors is an integer number (4105175987220).

Almost surely, 2^{16420551433499} is an apocalyptic number.

16420551433499 is a deficient number, since it is larger than the sum of its proper divisors (152515381).

16420551433499 is a wasteful number, since it uses less digits than its factorization.

16420551433499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152515380.

The product of its (nonzero) digits is 13996800, while the sum is 56.

The spelling of 16420551433499 in words is "sixteen trillion, four hundred twenty billion, five hundred fifty-one million, four hundred thirty-three thousand, four hundred ninety-nine".