33413399981 has 16 divisors (see below), whose sum is σ = 38089195200. Its totient is φ = 29056537728.

The previous prime is 33413399963. The next prime is 33413400071. The reversal of 33413399981 is 18999331433.

It is a cyclic number.

It is not a de Polignac number, because 33413399981 - 2¹⁰ = 33413398957 is a prime.

It is a super-2 number, since 2×33413399981² (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 (33413399951) 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, 333656 + ... + 422081.

It is an arithmetic number, because the mean of its divisors is an integer number (2380574700).

Almost surely, 2^33413399981 is an apocalyptic number.

It is an amenable number.

33413399981 is a deficient number, since it is larger than the sum of its proper divisors (4675795219).

33413399981 is a wasteful number, since it uses less digits than its factorization.

33413399981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755948.

The product of its digits is 1889568, while the sum is 53.

The spelling of 33413399981 in words is "thirty-three billion, four hundred thirteen million, three hundred ninety-nine thousand, nine hundred eighty-one".