16440439561 has 16 divisors (see below), whose sum is σ = 20932128000. Its totient is φ = 12559272768.

The previous prime is 16440439559. The next prime is 16440439579. The reversal of 16440439561 is 16593404461.

It is not a de Polignac number, because 16440439561 - 2¹ = 16440439559 is a prime.

It is a super-3 number, since 3×16440439561³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16440439531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3112261 + ... + 3117538.

It is an arithmetic number, because the mean of its divisors is an integer number (1308258000).

Almost surely, 2^16440439561 is an apocalyptic number.

It is an amenable number.

16440439561 is a deficient number, since it is larger than the sum of its proper divisors (4491688439).

16440439561 is a wasteful number, since it uses less digits than its factorization.

16440439561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6229848.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 16440439561 in words is "sixteen billion, four hundred forty million, four hundred thirty-nine thousand, five hundred sixty-one".