16639484401 has 4 divisors (see below), whose sum is σ = 16993516032. Its totient is φ = 16285452772.

The previous prime is 16639484347. The next prime is 16639484429. The reversal of 16639484401 is 10448493661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10448493661 = 19 ⋅549920719.

It is a cyclic number.

It is not a de Polignac number, because 16639484401 - 2¹⁷ = 16639353329 is a prime.

It is a super-2 number, since 2×16639484401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16639484431) 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, 177015745 + ... + 177015838.

It is an arithmetic number, because the mean of its divisors is an integer number (4248379008).

Almost surely, 2^16639484401 is an apocalyptic number.

It is an amenable number.

16639484401 is a deficient number, since it is larger than the sum of its proper divisors (354031631).

16639484401 is an equidigital number, since it uses as much as digits as its factorization.

16639484401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354031630.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 16639484401 in words is "sixteen billion, six hundred thirty-nine million, four hundred eighty-four thousand, four hundred one".