663260551 has 2 divisors, whose sum is σ = 663260552. Its totient is φ = 663260550.

The previous prime is 663260539. The next prime is 663260597. The reversal of 663260551 is 155062366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663260551 - 2¹⁷ = 663129479 is a prime.

It is a super-3 number, since 3×663260551³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663260501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331630275 + 331630276.

It is an arithmetic number, because the mean of its divisors is an integer number (331630276).

Almost surely, 2^663260551 is an apocalyptic number.

663260551 is a deficient number, since it is larger than the sum of its proper divisors (1).

663260551 is an equidigital number, since it uses as much as digits as its factorization.

663260551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 663260551 is about 25753.8453633627. The cubic root of 663260551 is about 872.0901657283.

The spelling of 663260551 in words is "six hundred sixty-three million, two hundred sixty thousand, five hundred fifty-one".