17949910857 has 4 divisors (see below), whose sum is σ = 23933214480. Its totient is φ = 11966607236.

The previous prime is 17949910787. The next prime is 17949910871. The reversal of 17949910857 is 75801994971.

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.

It is a cyclic number.

It is not a de Polignac number, because 17949910857 - 2⁷ = 17949910729 is a prime.

It is a super-3 number, since 3×17949910857³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 17949910857.

It is not an unprimeable number, because it can be changed into a prime (17949910877) 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, 2991651807 + ... + 2991651812.

It is an arithmetic number, because the mean of its divisors is an integer number (5983303620).

Almost surely, 2^17949910857 is an apocalyptic number.

It is an amenable number.

17949910857 is a deficient number, since it is larger than the sum of its proper divisors (5983303623).

17949910857 is an equidigital number, since it uses as much as digits as its factorization.

17949910857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5983303622.

The product of its (nonzero) digits is 5715360, while the sum is 60.

The spelling of 17949910857 in words is "seventeen billion, nine hundred forty-nine million, nine hundred ten thousand, eight hundred fifty-seven".