16639963996 has 6 divisors (see below), whose sum is σ = 29119937000. Its totient is φ = 8319981996.

The previous prime is 16639963993. The next prime is 16639963997. The reversal of 16639963996 is 69936993661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16639963993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2079995496 + ... + 2079995503.

Almost surely, 2^16639963996 is an apocalyptic number.

It is an amenable number.

16639963996 is a deficient number, since it is larger than the sum of its proper divisors (12479973004).

16639963996 is a wasteful number, since it uses less digits than its factorization.

16639963996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159991003 (or 4159991001 counting only the distinct ones).

The product of its digits is 76527504, while the sum is 67.

The spelling of 16639963996 in words is "sixteen billion, six hundred thirty-nine million, nine hundred sixty-three thousand, nine hundred ninety-six".