16638892943 has 4 divisors (see below), whose sum is σ = 16639910760. Its totient is φ = 16637875128.

The previous prime is 16638892913. The next prime is 16638892951. The reversal of 16638892943 is 34929883661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34929883661 = 73 ⋅478491557.

It is a cyclic number.

It is not a de Polignac number, because 16638892943 - 2¹⁶ = 16638827407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16638892903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483980 + ... + 517217.

It is an arithmetic number, because the mean of its divisors is an integer number (4159977690).

Almost surely, 2^16638892943 is an apocalyptic number.

16638892943 is a deficient number, since it is larger than the sum of its proper divisors (1017817).

16638892943 is a wasteful number, since it uses less digits than its factorization.

16638892943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017816.

The product of its digits is 13436928, while the sum is 59.

The spelling of 16638892943 in words is "sixteen billion, six hundred thirty-eight million, eight hundred ninety-two thousand, nine hundred forty-three".