20651642567 has 2 divisors, whose sum is σ = 20651642568. Its totient is φ = 20651642566.

The previous prime is 20651642521. The next prime is 20651642623. The reversal of 20651642567 is 76524615602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20651642567 - 2²⁴ = 20634865351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20651642267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10325821283 + 10325821284.

It is an arithmetic number, because the mean of its divisors is an integer number (10325821284).

Almost surely, 2^20651642567 is an apocalyptic number.

20651642567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20651642567 is an equidigital number, since it uses as much as digits as its factorization.

20651642567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 20651642567 in words is "twenty billion, six hundred fifty-one million, six hundred forty-two thousand, five hundred sixty-seven".