33491818987 has 4 divisors (see below), whose sum is σ = 36536529816. Its totient is φ = 30447108160.

The previous prime is 33491818951. The next prime is 33491818999. The reversal of 33491818987 is 78981819433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78981819433 = 11 ⋅7180165403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33491818987 is a prime.

It is a super-2 number, since 2×33491818987² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33491813987) 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, 1522355398 + ... + 1522355419.

It is an arithmetic number, because the mean of its divisors is an integer number (9134132454).

Almost surely, 2^33491818987 is an apocalyptic number.

33491818987 is a deficient number, since it is larger than the sum of its proper divisors (3044710829).

33491818987 is a wasteful number, since it uses less digits than its factorization.

33491818987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044710828.

The product of its digits is 10450944, while the sum is 61.

The spelling of 33491818987 in words is "thirty-three billion, four hundred ninety-one million, eight hundred eighteen thousand, nine hundred eighty-seven".