20663655403 has 2 divisors, whose sum is σ = 20663655404. Its totient is φ = 20663655402.

The previous prime is 20663655379. The next prime is 20663655407. The reversal of 20663655403 is 30455636602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20663655403 is a prime.

It is a super-2 number, since 2×20663655403² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20663655407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331827701 + 10331827702.

It is an arithmetic number, because the mean of its divisors is an integer number (10331827702).

Almost surely, 2^20663655403 is an apocalyptic number.

20663655403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663655403 is an equidigital number, since it uses as much as digits as its factorization.

20663655403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 40.

The spelling of 20663655403 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, four hundred three".