16623647668 has 12 divisors (see below), whose sum is σ = 29158572100. Its totient is φ = 8292627072.

The previous prime is 16623647653. The next prime is 16623647687. The reversal of 16623647668 is 86674632661.

It can be written as a sum of positive squares in 2 ways, for example, as 9453283984 + 7170363684 = 97228^2 + 84678^2 .

It is a congruent number.

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, 4797243 + ... + 4800706.

Almost surely, 2^16623647668 is an apocalyptic number.

It is an amenable number.

16623647668 is a deficient number, since it is larger than the sum of its proper divisors (12534924432).

16623647668 is a wasteful number, since it uses less digits than its factorization.

16623647668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9598386 (or 9598384 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 55.

The spelling of 16623647668 in words is "sixteen billion, six hundred twenty-three million, six hundred forty-seven thousand, six hundred sixty-eight".