20664153673 has 2 divisors, whose sum is σ = 20664153674. Its totient is φ = 20664153672.

The previous prime is 20664153613. The next prime is 20664153677. The reversal of 20664153673 is 37635146602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14460543504 + 6203610169 = 120252^2 + 78763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20664153673 is a prime.

It is not a weakly prime, because it can be changed into another prime (20664153677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332076836 + 10332076837.

It is an arithmetic number, because the mean of its divisors is an integer number (10332076837).

Almost surely, 2^20664153673 is an apocalyptic number.

It is an amenable number.

20664153673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20664153673 is an equidigital number, since it uses as much as digits as its factorization.

20664153673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 43.

The spelling of 20664153673 in words is "twenty billion, six hundred sixty-four million, one hundred fifty-three thousand, six hundred seventy-three".