20667233617 has 2 divisors, whose sum is σ = 20667233618. Its totient is φ = 20667233616.

The previous prime is 20667233599. The next prime is 20667233651. The reversal of 20667233617 is 71633276602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18852388416 + 1814845201 = 137304^2 + 42601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20667233617 is a prime.

It is not a weakly prime, because it can be changed into another prime (20667233017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10333616808 + 10333616809.

It is an arithmetic number, because the mean of its divisors is an integer number (10333616809).

Almost surely, 2^20667233617 is an apocalyptic number.

It is an amenable number.

20667233617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20667233617 is an equidigital number, since it uses as much as digits as its factorization.

20667233617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 43.

The spelling of 20667233617 in words is "twenty billion, six hundred sixty-seven million, two hundred thirty-three thousand, six hundred seventeen".