33687266681 has 2 divisors, whose sum is σ = 33687266682. Its totient is φ = 33687266680.

The previous prime is 33687266677. The next prime is 33687266719. The reversal of 33687266681 is 18666278633.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29415337081 + 4271929600 = 171509^2 + 65360^2 .

It is a cyclic number.

It is not a de Polignac number, because 33687266681 - 2² = 33687266677 is a prime.

It is a super-2 number, since 2×33687266681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33687266611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16843633340 + 16843633341.

It is an arithmetic number, because the mean of its divisors is an integer number (16843633341).

Almost surely, 2^33687266681 is an apocalyptic number.

It is an amenable number.

33687266681 is a deficient number, since it is larger than the sum of its proper divisors (1).

33687266681 is an equidigital number, since it uses as much as digits as its factorization.

33687266681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 56.

The spelling of 33687266681 in words is "thirty-three billion, six hundred eighty-seven million, two hundred sixty-six thousand, six hundred eighty-one".