16389376441 has 3 divisors (see below), whose sum is σ = 16389504463. Its totient is φ = 16389248420.

The previous prime is 16389376417. The next prime is 16389376559. The reversal of 16389376441 is 14467398361.

The square root of 16389376441 is 128021.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1265296041 + 15124080400 = 35571^2 + 122980^2 .

It is not a de Polignac number, because 16389376441 - 2⁷ = 16389376313 is a prime.

It is a super-2 number, since 2×16389376441² (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 (16389376411) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 64011 + ... + 192031.

Almost surely, 2^16389376441 is an apocalyptic number.

16389376441 is the 128021-st square number.

16389376441 is the 64011-st centered octagonal number.

It is an amenable number.

16389376441 is a deficient number, since it is larger than the sum of its proper divisors (128022).

16389376441 is an frugal number, since it uses more digits than its factorization.

16389376441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256042 (or 128021 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 52.

The spelling of 16389376441 in words is "sixteen billion, three hundred eighty-nine million, three hundred seventy-six thousand, four hundred forty-one".