16664400505 has 16 divisors (see below), whose sum is σ = 20046216960. Its totient is φ = 13298938432.

The previous prime is 16664400499. The next prime is 16664400539. The reversal of 16664400505 is 50500446661.

16664400505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16664400505 - 2³ = 16664400497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5973651 + ... + 5976439.

It is an arithmetic number, because the mean of its divisors is an integer number (1252888560).

Almost surely, 2^16664400505 is an apocalyptic number.

It is an amenable number.

16664400505 is a deficient number, since it is larger than the sum of its proper divisors (3381816455).

16664400505 is a wasteful number, since it uses less digits than its factorization.

16664400505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 16664400505 in words is "sixteen billion, six hundred sixty-four million, four hundred thousand, five hundred five".