20663030551 has 2 divisors, whose sum is σ = 20663030552. Its totient is φ = 20663030550.

The previous prime is 20663030543. The next prime is 20663030567. The reversal of 20663030551 is 15503036602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20663030551 - 2³ = 20663030543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20663030951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331515275 + 10331515276.

It is an arithmetic number, because the mean of its divisors is an integer number (10331515276).

Almost surely, 2^20663030551 is an apocalyptic number.

20663030551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663030551 is an equidigital number, since it uses as much as digits as its factorization.

20663030551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 31.

The spelling of 20663030551 in words is "twenty billion, six hundred sixty-three million, thirty thousand, five hundred fifty-one".