33855999989 has 4 divisors (see below), whose sum is σ = 38692571424. Its totient is φ = 29019428556.

The previous prime is 33855999959. The next prime is 33856000027. The reversal of 33855999989 is 98999955833.

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: 98999955833 = 47 ⋅2106382039.

It is a cyclic number.

It is not a de Polignac number, because 33855999989 - 2²⁴ = 33839222773 is a prime.

It is a super-2 number, since 2×33855999989² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33855999959) 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, 2418285707 + ... + 2418285720.

It is an arithmetic number, because the mean of its divisors is an integer number (9673142856).

Almost surely, 2^33855999989 is an apocalyptic number.

It is an amenable number.

33855999989 is a deficient number, since it is larger than the sum of its proper divisors (4836571435).

33855999989 is an equidigital number, since it uses as much as digits as its factorization.

33855999989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836571434.

The product of its digits is 850305600, while the sum is 77.

The spelling of 33855999989 in words is "thirty-three billion, eight hundred fifty-five million, nine hundred ninety-nine thousand, nine hundred eighty-nine".