16564658464 has 48 divisors (see below), whose sum is σ = 33618223800. Its totient is φ = 8028370944.

The previous prime is 16564658449. The next prime is 16564658497. The reversal of 16564658464 is 46485646561.

It can be written as a sum of positive squares in 4 ways, for example, as 16510194064 + 54464400 = 128492^2 + 7380^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292492 + ... + 344500.

Almost surely, 2^16564658464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16564658464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16809111900).

16564658464 is an abundant number, since it is smaller than the sum of its proper divisors (17053565336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16564658464 is a wasteful number, since it uses less digits than its factorization.

16564658464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52325 (or 52317 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 55.

The spelling of 16564658464 in words is "sixteen billion, five hundred sixty-four million, six hundred fifty-eight thousand, four hundred sixty-four".