16338832561 has 4 divisors (see below), whose sum is σ = 16347796992. Its totient is φ = 16329868132.

The previous prime is 16338832547. The next prime is 16338832567. The reversal of 16338832561 is 16523883361.

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: 16523883361 = 97 ⋅170349313.

It is a cyclic number.

It is not a de Polignac number, because 16338832561 - 2⁹ = 16338832049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16338832567) 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, 4479481 + ... + 4483126.

It is an arithmetic number, because the mean of its divisors is an integer number (4086949248).

Almost surely, 2^16338832561 is an apocalyptic number.

It is an amenable number.

16338832561 is a deficient number, since it is larger than the sum of its proper divisors (8964431).

16338832561 is an equidigital number, since it uses as much as digits as its factorization.

16338832561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8964430.

The product of its digits is 622080, while the sum is 46.

The spelling of 16338832561 in words is "sixteen billion, three hundred thirty-eight million, eight hundred thirty-two thousand, five hundred sixty-one".