663536261 has 2 divisors, whose sum is σ = 663536262. Its totient is φ = 663536260.

The previous prime is 663536189. The next prime is 663536303. The reversal of 663536261 is 162635366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 632522500 + 31013761 = 25150^2 + 5569^2 .

It is a cyclic number.

It is not a de Polignac number, because 663536261 - 2²⁶ = 596427397 is a prime.

It is equal to p_34460399 and since 663536261 and 34460399 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663536161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331768130 + 331768131.

It is an arithmetic number, because the mean of its divisors is an integer number (331768131).

Almost surely, 2^663536261 is an apocalyptic number.

It is an amenable number.

663536261 is a deficient number, since it is larger than the sum of its proper divisors (1).

663536261 is an equidigital number, since it uses as much as digits as its factorization.

663536261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 38.

The square root of 663536261 is about 25759.1976000806. The cubic root of 663536261 is about 872.2109883675.

The spelling of 663536261 in words is "six hundred sixty-three million, five hundred thirty-six thousand, two hundred sixty-one".