20554660619 has 2 divisors, whose sum is σ = 20554660620. Its totient is φ = 20554660618.

The previous prime is 20554660601. The next prime is 20554660649. The reversal of 20554660619 is 91606645502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20554660619 - 2³² = 16259693323 is a prime.

It is a super-4 number, since 4×20554660619⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 20554660619.

It is not a weakly prime, because it can be changed into another prime (20554660649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10277330309 + 10277330310.

It is an arithmetic number, because the mean of its divisors is an integer number (10277330310).

Almost surely, 2^20554660619 is an apocalyptic number.

20554660619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20554660619 is an equidigital number, since it uses as much as digits as its factorization.

20554660619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 20554660619 in words is "twenty billion, five hundred fifty-four million, six hundred sixty thousand, six hundred nineteen".