20626466639687 has 2 divisors, whose sum is σ = 20626466639688. Its totient is φ = 20626466639686.

The previous prime is 20626466639683. The next prime is 20626466639711. The reversal of 20626466639687 is 78693666462602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20626466639687 - 2² = 20626466639683 is a prime.

It is a super-2 number, since 2×20626466639687² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20626466639687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20626466639683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10313233319843 + 10313233319844.

It is an arithmetic number, because the mean of its divisors is an integer number (10313233319844).

Almost surely, 2^{20626466639687} is an apocalyptic number.

20626466639687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20626466639687 is an equidigital number, since it uses as much as digits as its factorization.

20626466639687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128701952, while the sum is 71.

The spelling of 20626466639687 in words is "twenty trillion, six hundred twenty-six billion, four hundred sixty-six million, six hundred thirty-nine thousand, six hundred eighty-seven".