33782690681 has 2 divisors, whose sum is σ = 33782690682. Its totient is φ = 33782690680.

The previous prime is 33782690663. The next prime is 33782690693. The reversal of 33782690681 is 18609628733.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33650233600 + 132457081 = 183440^2 + 11509^2 .

It is a cyclic number.

It is not a de Polignac number, because 33782690681 - 2²² = 33778496377 is a prime.

It is a super-2 number, since 2×33782690681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33782690611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16891345340 + 16891345341.

It is an arithmetic number, because the mean of its divisors is an integer number (16891345341).

Almost surely, 2^33782690681 is an apocalyptic number.

It is an amenable number.

33782690681 is a deficient number, since it is larger than the sum of its proper divisors (1).

33782690681 is an equidigital number, since it uses as much as digits as its factorization.

33782690681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 33782690681 in words is "thirty-three billion, seven hundred eighty-two million, six hundred ninety thousand, six hundred eighty-one".