33397788381 has 4 divisors (see below), whose sum is σ = 44530384512. Its totient is φ = 22265192252.

The previous prime is 33397788377. The next prime is 33397788397. The reversal of 33397788381 is 18388779333.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33397788381 - 2² = 33397788377 is a prime.

It is a super-2 number, since 2×33397788381² (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 (33397788371) 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, 5566298061 + ... + 5566298066.

It is an arithmetic number, because the mean of its divisors is an integer number (11132596128).

Almost surely, 2^33397788381 is an apocalyptic number.

It is an amenable number.

33397788381 is a deficient number, since it is larger than the sum of its proper divisors (11132596131).

33397788381 is a wasteful number, since it uses less digits than its factorization.

33397788381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11132596130.

The product of its digits is 18289152, while the sum is 60.

The spelling of 33397788381 in words is "thirty-three billion, three hundred ninety-seven million, seven hundred eighty-eight thousand, three hundred eighty-one".