17985008401 has 4 divisors (see below), whose sum is σ = 18766965312. Its totient is φ = 17203051492.

The previous prime is 17985008389. The next prime is 17985008443. The reversal of 17985008401 is 10480058971.

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: 10480058971 = 3449 ⋅3038579.

It is a cyclic number.

It is not a de Polignac number, because 17985008401 - 2⁵ = 17985008369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17985608401) 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, 390978421 + ... + 390978466.

It is an arithmetic number, because the mean of its divisors is an integer number (4691741328).

Almost surely, 2^17985008401 is an apocalyptic number.

It is an amenable number.

17985008401 is a deficient number, since it is larger than the sum of its proper divisors (781956911).

17985008401 is an equidigital number, since it uses as much as digits as its factorization.

17985008401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781956910.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 17985008401 in words is "seventeen billion, nine hundred eighty-five million, eight thousand, four hundred one".