20716916909033 has 2 divisors, whose sum is σ = 20716916909034. Its totient is φ = 20716916909032.

The previous prime is 20716916909021. The next prime is 20716916909173. The reversal of 20716916909033 is 33090961961702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15476883160489 + 5240033748544 = 3934067^2 + 2289112^2 .

It is a cyclic number.

It is not a de Polignac number, because 20716916909033 - 2²⁶ = 20716849800169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20716916909033.

It is not a weakly prime, because it can be changed into another prime (20716916909833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10358458454516 + 10358458454517.

It is an arithmetic number, because the mean of its divisors is an integer number (10358458454517).

Almost surely, 2^{20716916909033} is an apocalyptic number.

It is an amenable number.

20716916909033 is a deficient number, since it is larger than the sum of its proper divisors (1).

20716916909033 is an equidigital number, since it uses as much as digits as its factorization.

20716916909033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3306744, while the sum is 56.

The spelling of 20716916909033 in words is "twenty trillion, seven hundred sixteen billion, nine hundred sixteen million, nine hundred nine thousand, thirty-three".