33138733491 has 24 divisors (see below), whose sum is σ = 48690807360. Its totient is φ = 21712489776.

The previous prime is 33138733489. The next prime is 33138733541. The reversal of 33138733491 is 19433783133.

It is not a de Polignac number, because 33138733491 - 2¹ = 33138733489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (33138733421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3650340 + ... + 3659406.

It is an arithmetic number, because the mean of its divisors is an integer number (2028783640).

Almost surely, 2^33138733491 is an apocalyptic number.

33138733491 is a deficient number, since it is larger than the sum of its proper divisors (15552073869).

33138733491 is a wasteful number, since it uses less digits than its factorization.

33138733491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16015 (or 16012 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The spelling of 33138733491 in words is "thirty-three billion, one hundred thirty-eight million, seven hundred thirty-three thousand, four hundred ninety-one".