20648884651 has 2 divisors, whose sum is σ = 20648884652. Its totient is φ = 20648884650.

The previous prime is 20648884577. The next prime is 20648884679. The reversal of 20648884651 is 15648884602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20648884651 - 2¹⁷ = 20648753579 is a prime.

It is not a weakly prime, because it can be changed into another prime (20648884351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324442325 + 10324442326.

It is an arithmetic number, because the mean of its divisors is an integer number (10324442326).

Almost surely, 2^20648884651 is an apocalyptic number.

20648884651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648884651 is an equidigital number, since it uses as much as digits as its factorization.

20648884651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2949120, while the sum is 52.

The spelling of 20648884651 in words is "twenty billion, six hundred forty-eight million, eight hundred eighty-four thousand, six hundred fifty-one".