17964966649 has 4 divisors (see below), whose sum is σ = 20531390464. Its totient is φ = 15398542836.

The previous prime is 17964966641. The next prime is 17964966653. The reversal of 17964966649 is 94666946971.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94666946971 = 39671 ⋅2386301.

It is a cyclic number.

It is not a de Polignac number, because 17964966649 - 2³ = 17964966641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17964966641) 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 3 ways as a sum of consecutive naturals, for example, 1283211897 + ... + 1283211910.

It is an arithmetic number, because the mean of its divisors is an integer number (5132847616).

Almost surely, 2^17964966649 is an apocalyptic number.

It is an amenable number.

17964966649 is a deficient number, since it is larger than the sum of its proper divisors (2566423815).

17964966649 is an equidigital number, since it uses as much as digits as its factorization.

17964966649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566423814.

The product of its digits is 105815808, while the sum is 67.

The spelling of 17964966649 in words is "seventeen billion, nine hundred sixty-four million, nine hundred sixty-six thousand, six hundred forty-nine".