20651307672563 has 4 divisors (see below), whose sum is σ = 20724799870968. Its totient is φ = 20577815474160.

The previous prime is 20651307672557. The next prime is 20651307672587. The reversal of 20651307672563 is 36527670315602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20651307672563 - 2¹⁶ = 20651307607027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20651307671563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36746098781 + ... + 36746099342.

It is an arithmetic number, because the mean of its divisors is an integer number (5181199967742).

Almost surely, 2^{20651307672563} is an apocalyptic number.

20651307672563 is a deficient number, since it is larger than the sum of its proper divisors (73492198405).

20651307672563 is an equidigital number, since it uses as much as digits as its factorization.

20651307672563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73492198404.

The product of its (nonzero) digits is 9525600, while the sum is 53.

The spelling of 20651307672563 in words is "twenty trillion, six hundred fifty-one billion, three hundred seven million, six hundred seventy-two thousand, five hundred sixty-three".