20473606866961 has 2 divisors, whose sum is σ = 20473606866962. Its totient is φ = 20473606866960.

The previous prime is 20473606866959. The next prime is 20473606866989. The reversal of 20473606866961 is 16966860637402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20465046916561 + 8559950400 = 4523831^2 + 92520^2 .

It is a cyclic number.

It is not a de Polignac number, because 20473606866961 - 2¹ = 20473606866959 is a prime.

It is a super-2 number, since 2×20473606866961² (a number of 27 digits) contains 22 as substring.

Together with 20473606866959, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20473606866893 and 20473606866902.

It is not a weakly prime, because it can be changed into another prime (20473606866941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236803433480 + 10236803433481.

It is an arithmetic number, because the mean of its divisors is an integer number (10236803433481).

Almost surely, 2^{20473606866961} is an apocalyptic number.

It is an amenable number.

20473606866961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20473606866961 is an equidigital number, since it uses as much as digits as its factorization.

20473606866961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94058496, while the sum is 64.

The spelling of 20473606866961 in words is "twenty trillion, four hundred seventy-three billion, six hundred six million, eight hundred sixty-six thousand, nine hundred sixty-one".