20722068601457 has 2 divisors, whose sum is σ = 20722068601458. Its totient is φ = 20722068601456.

The previous prime is 20722068601447. The next prime is 20722068601489. The reversal of 20722068601457 is 75410686022702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18729818217616 + 1992250383841 = 4327796^2 + 1411471^2 .

It is a cyclic number.

It is not a de Polignac number, because 20722068601457 - 2¹² = 20722068597361 is a prime.

It is not a weakly prime, because it can be changed into another prime (20722068601447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361034300728 + 10361034300729.

It is an arithmetic number, because the mean of its divisors is an integer number (10361034300729).

Almost surely, 2^{20722068601457} is an apocalyptic number.

It is an amenable number.

20722068601457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20722068601457 is an equidigital number, since it uses as much as digits as its factorization.

20722068601457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 20722068601457 in words is "twenty trillion, seven hundred twenty-two billion, sixty-eight million, six hundred one thousand, four hundred fifty-seven".