20766946565047 has 2 divisors, whose sum is σ = 20766946565048. Its totient is φ = 20766946565046.

The previous prime is 20766946565041. The next prime is 20766946565161. The reversal of 20766946565047 is 74056564966702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20766946565047 - 2¹⁵ = 20766946532279 is a prime.

It is a super-2 number, since 2×20766946565047² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20766946565041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10383473282523 + 10383473282524.

It is an arithmetic number, because the mean of its divisors is an integer number (10383473282524).

Almost surely, 2^{20766946565047} is an apocalyptic number.

20766946565047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20766946565047 is an equidigital number, since it uses as much as digits as its factorization.

20766946565047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 457228800, while the sum is 67.

The spelling of 20766946565047 in words is "twenty trillion, seven hundred sixty-six billion, nine hundred forty-six million, five hundred sixty-five thousand, forty-seven".