20733664723361 has 2 divisors, whose sum is σ = 20733664723362. Its totient is φ = 20733664723360.

The previous prime is 20733664723349. The next prime is 20733664723423. The reversal of 20733664723361 is 16332746633702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20364632772961 + 369031950400 = 4512719^2 + 607480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20733664723361 is a prime.

It is not a weakly prime, because it can be changed into another prime (20733664783361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10366832361680 + 10366832361681.

It is an arithmetic number, because the mean of its divisors is an integer number (10366832361681).

Almost surely, 2^{20733664723361} is an apocalyptic number.

It is an amenable number.

20733664723361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20733664723361 is an equidigital number, since it uses as much as digits as its factorization.

20733664723361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13716864, while the sum is 53.

The spelling of 20733664723361 in words is "twenty trillion, seven hundred thirty-three billion, six hundred sixty-four million, seven hundred twenty-three thousand, three hundred sixty-one".