16821144725 has 96 divisors (see below), whose sum is σ = 26415666432. Its totient is φ = 10407936000.

The previous prime is 16821144713. The next prime is 16821144727. The reversal of 16821144725 is 52744112861.

It is not a de Polignac number, because 16821144725 - 2⁴ = 16821144709 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 (16821144727) 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 95 ways as a sum of consecutive naturals, for example, 59861585 + ... + 59861865.

It is an arithmetic number, because the mean of its divisors is an integer number (275163192).

Almost surely, 2^16821144725 is an apocalyptic number.

It is an amenable number.

16821144725 is a deficient number, since it is larger than the sum of its proper divisors (9594521707).

16821144725 is a wasteful number, since it uses less digits than its factorization.

16821144725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 561 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The spelling of 16821144725 in words is "sixteen billion, eight hundred twenty-one million, one hundred forty-four thousand, seven hundred twenty-five".