33947780893 has 4 divisors (see below), whose sum is σ = 36559148668. Its totient is φ = 31336413120.

The previous prime is 33947780869. The next prime is 33947780921. The reversal of 33947780893 is 39808774933.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14108213284 + 19839567609 = 118778^2 + 140853^2 .

It is a cyclic number.

It is not a de Polignac number, because 33947780893 - 2⁵ = 33947780861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33947780803) 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, 1305683868 + ... + 1305683893.

It is an arithmetic number, because the mean of its divisors is an integer number (9139787167).

Almost surely, 2^33947780893 is an apocalyptic number.

It is an amenable number.

33947780893 is a deficient number, since it is larger than the sum of its proper divisors (2611367775).

33947780893 is a wasteful number, since it uses less digits than its factorization.

33947780893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611367774.

The product of its (nonzero) digits is 27433728, while the sum is 61.

The spelling of 33947780893 in words is "thirty-three billion, nine hundred forty-seven million, seven hundred eighty thousand, eight hundred ninety-three".