16638239528 has 8 divisors (see below), whose sum is σ = 31196699130. Its totient is φ = 8319119760.

The previous prime is 16638239521. The next prime is 16638239549. The reversal of 16638239528 is 82593283661.

It can be written as a sum of positive squares in only one way, i.e., 14529409444 + 2108830084 = 120538^2 + 45922^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×16638239528² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16638239528.

It is not an unprimeable number, because it can be changed into a prime (16638239521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1039889963 + ... + 1039889978.

Almost surely, 2^16638239528 is an apocalyptic number.

It is an amenable number.

16638239528 is a deficient number, since it is larger than the sum of its proper divisors (14558459602).

16638239528 is a wasteful number, since it uses less digits than its factorization.

16638239528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079779947 (or 2079779943 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 53.

The spelling of 16638239528 in words is "sixteen billion, six hundred thirty-eight million, two hundred thirty-nine thousand, five hundred twenty-eight".