16520664562 has 8 divisors (see below), whose sum is σ = 24801429996. Its totient is φ = 8253521232.

The previous prime is 16520664557. The next prime is 16520664593. The reversal of 16520664562 is 26546602561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15368808841 + 1151855721 = 123971^2 + 33939^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3402493 + ... + 3407344.

Almost surely, 2^16520664562 is an apocalyptic number.

16520664562 is a deficient number, since it is larger than the sum of its proper divisors (8280765434).

16520664562 is a wasteful number, since it uses less digits than its factorization.

16520664562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6811052.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 16520664562 in words is "sixteen billion, five hundred twenty million, six hundred sixty-four thousand, five hundred sixty-two".