16516009973 has 4 divisors (see below), whose sum is σ = 16519799808. Its totient is φ = 16512220140.

The previous prime is 16516009963. The next prime is 16516009997. The reversal of 16516009973 is 37990061561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16516009973 - 2⁴ = 16516009957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16516009963) 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, 1888373 + ... + 1897098.

It is an arithmetic number, because the mean of its divisors is an integer number (4129949952).

Almost surely, 2^16516009973 is an apocalyptic number.

It is an amenable number.

16516009973 is a deficient number, since it is larger than the sum of its proper divisors (3789835).

16516009973 is an equidigital number, since it uses as much as digits as its factorization.

16516009973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789834.

The product of its (nonzero) digits is 306180, while the sum is 47.

The spelling of 16516009973 in words is "sixteen billion, five hundred sixteen million, nine thousand, nine hundred seventy-three".