33261261280 has 96 divisors (see below), whose sum is σ = 84671915328. Its totient is φ = 12274176000.

The previous prime is 33261261169. The next prime is 33261261289. The reversal of 33261261280 is 8216216233.

It is a super-2 number, since 2×33261261280² (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 (33261261289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5074005 + ... + 5080555.

It is an arithmetic number, because the mean of its divisors is an integer number (881999118).

Almost surely, 2^33261261280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33261261280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42335957664).

33261261280 is an abundant number, since it is smaller than the sum of its proper divisors (51410654048).

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

33261261280 is a wasteful number, since it uses less digits than its factorization.

33261261280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9020 (or 9012 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 33261261280 in words is "thirty-three billion, two hundred sixty-one million, two hundred sixty-one thousand, two hundred eighty".