33531641664 has 28 divisors (see below), whose sum is σ = 88719135744. Its totient is φ = 11177213824.

The previous prime is 33531641639. The next prime is 33531641669. The reversal of 33531641664 is 46614613533.

It is a super-2 number, since 2×33531641664² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33531641669) 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, 87321792 + ... + 87322175.

Almost surely, 2^33531641664 is an apocalyptic number.

It is an amenable number.

33531641664 is an abundant number, since it is smaller than the sum of its proper divisors (55187494080).

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

33531641664 is a wasteful number, since it uses less digits than its factorization.

33531641664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174643982 (or 174643972 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The spelling of 33531641664 in words is "thirty-three billion, five hundred thirty-one million, six hundred forty-one thousand, six hundred sixty-four".