17918058649649 has 4 divisors (see below), whose sum is σ = 17918067713136. Its totient is φ = 17918049586164.

The previous prime is 17918058649553. The next prime is 17918058649651. The reversal of 17918058649649 is 94694685081971.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 17918058649649 - 2²⁸ = 17917790214193 is a prime.

It is a super-2 number, since 2×17918058649649² (a number of 27 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 17918058649649.

It is not an unprimeable number, because it can be changed into a prime (17918058648649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161459 + ... + 5988504.

It is an arithmetic number, because the mean of its divisors is an integer number (4479516928284).

Almost surely, 2^{17918058649649} is an apocalyptic number.

It is an amenable number.

17918058649649 is a deficient number, since it is larger than the sum of its proper divisors (9063487).

17918058649649 is an equidigital number, since it uses as much as digits as its factorization.

17918058649649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9063486.

The product of its (nonzero) digits is 940584960, while the sum is 77.

The spelling of 17918058649649 in words is "seventeen trillion, nine hundred eighteen billion, fifty-eight million, six hundred forty-nine thousand, six hundred forty-nine".