16438959536 has 10 divisors (see below), whose sum is σ = 31850484132. Its totient is φ = 8219479760.

The previous prime is 16438959443. The next prime is 16438959539. The reversal of 16438959536 is 63595983461.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16438959539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 513717470 + ... + 513717501.

Almost surely, 2^16438959536 is an apocalyptic number.

16438959536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16438959536 is a deficient number, since it is larger than the sum of its proper divisors (15411524596).

16438959536 is a wasteful number, since it uses less digits than its factorization.

16438959536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027434979 (or 1027434973 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 59.

The spelling of 16438959536 in words is "sixteen billion, four hundred thirty-eight million, nine hundred fifty-nine thousand, five hundred thirty-six".