16645140385 has 8 divisors (see below), whose sum is σ = 21149119656. Its totient is φ = 12532811520.

The previous prime is 16645140349. The next prime is 16645140431. The reversal of 16645140385 is 58304154661.

It can be written as a sum of positive squares in 4 ways, for example, as 3215343616 + 13429796769 = 56704^2 + 115887^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16645140385 - 2⁹ = 16645139873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97912506 + ... + 97912675.

It is an arithmetic number, because the mean of its divisors is an integer number (2643639957).

Almost surely, 2^16645140385 is an apocalyptic number.

It is an amenable number.

16645140385 is a deficient number, since it is larger than the sum of its proper divisors (4503979271).

16645140385 is a wasteful number, since it uses less digits than its factorization.

16645140385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195825203.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 16645140385 in words is "sixteen billion, six hundred forty-five million, one hundred forty thousand, three hundred eighty-five".