33921778816 has 32 divisors (see below), whose sum is σ = 67928741100. Its totient is φ = 16872996864.

The previous prime is 33921778783. The next prime is 33921778837. The reversal of 33921778816 is 61887712933.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33817738816 + 104040000 = 183896^2 + 10200^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661861 + ... + 711268.

Almost surely, 2^33921778816 is an apocalyptic number.

It is an amenable number.

33921778816 is an abundant number, since it is smaller than the sum of its proper divisors (34006962284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33921778816 is a wasteful number, since it uses less digits than its factorization.

33921778816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373336 (or 1373324 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 55.

The spelling of 33921778816 in words is "thirty-three billion, nine hundred twenty-one million, seven hundred seventy-eight thousand, eight hundred sixteen".