17941399645 has 16 divisors (see below), whose sum is σ = 23243662512. Its totient is φ = 13215974400.

The previous prime is 17941399639. The next prime is 17941399649. The reversal of 17941399645 is 54699314971.

It can be written as a sum of positive squares in 8 ways, for example, as 653620356 + 17287779289 = 25566^2 + 131483^2 .

It is not a de Polignac number, because 17941399645 - 2¹¹ = 17941397597 is a prime.

It is a super-2 number, since 2×17941399645² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17941399645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17941399649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318102 + ... + 370231.

It is an arithmetic number, because the mean of its divisors is an integer number (1452728907).

Almost surely, 2^17941399645 is an apocalyptic number.

It is an amenable number.

17941399645 is a deficient number, since it is larger than the sum of its proper divisors (5302262867).

17941399645 is a wasteful number, since it uses less digits than its factorization.

17941399645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688752.

The product of its digits is 7348320, while the sum is 58.

The spelling of 17941399645 in words is "seventeen billion, nine hundred forty-one million, three hundred ninety-nine thousand, six hundred forty-five".