33686868521 has 8 divisors (see below), whose sum is σ = 34473488544. Its totient is φ = 32900394240.

The previous prime is 33686868473. The next prime is 33686868533. The reversal of 33686868521 is 12586868633.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33686868521 is a prime.

It is a super-2 number, since 2×33686868521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33686868541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534350 + ... + 594056.

It is an arithmetic number, because the mean of its divisors is an integer number (4309186068).

Almost surely, 2^33686868521 is an apocalyptic number.

It is an amenable number.

33686868521 is a deficient number, since it is larger than the sum of its proper divisors (786620023).

33686868521 is a wasteful number, since it uses less digits than its factorization.

33686868521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72871.

The product of its digits is 9953280, while the sum is 56.

The spelling of 33686868521 in words is "thirty-three billion, six hundred eighty-six million, eight hundred sixty-eight thousand, five hundred twenty-one".