20663336557 has 2 divisors, whose sum is σ = 20663336558. Its totient is φ = 20663336556.

The previous prime is 20663336527. The next prime is 20663336587. The reversal of 20663336557 is 75563336602.

It is a balanced prime because it is at equal distance from previous prime (20663336527) and next prime (20663336587).

It can be written as a sum of positive squares in only one way, i.e., 13244787396 + 7418549161 = 115086^2 + 86131^2 .

It is a cyclic number.

It is not a de Polignac number, because 20663336557 - 2⁷ = 20663336429 is a prime.

It is a super-2 number, since 2×20663336557² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20663336527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331668278 + 10331668279.

It is an arithmetic number, because the mean of its divisors is an integer number (10331668279).

Almost surely, 2^20663336557 is an apocalyptic number.

It is an amenable number.

20663336557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663336557 is an equidigital number, since it uses as much as digits as its factorization.

20663336557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 46.

The spelling of 20663336557 in words is "twenty billion, six hundred sixty-three million, three hundred thirty-six thousand, five hundred fifty-seven".