17993345649 has 32 divisors (see below), whose sum is σ = 26227224576. Its totient is φ = 10927687680.

The previous prime is 17993345621. The next prime is 17993345659. The reversal of 17993345649 is 94654339971.

It is a happy number.

It is not a de Polignac number, because 17993345649 - 2⁷ = 17993345521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17993345592 and 17993345601.

It is not an unprimeable number, because it can be changed into a prime (17993345659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231679 + ... + 299435.

It is an arithmetic number, because the mean of its divisors is an integer number (819600768).

Almost surely, 2^17993345649 is an apocalyptic number.

It is an amenable number.

17993345649 is a deficient number, since it is larger than the sum of its proper divisors (8233878927).

17993345649 is a wasteful number, since it uses less digits than its factorization.

17993345649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67945.

The product of its digits is 22044960, while the sum is 60.

The spelling of 17993345649 in words is "seventeen billion, nine hundred ninety-three million, three hundred forty-five thousand, six hundred forty-nine".