663261355 has 4 divisors (see below), whose sum is σ = 795913632. Its totient is φ = 530609080.

The previous prime is 663261343. The next prime is 663261359. The reversal of 663261355 is 553162366.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 663261355 - 2⁵ = 663261323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663261359) 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 in 3 ways as a sum of consecutive naturals, for example, 66326131 + ... + 66326140.

It is an arithmetic number, because the mean of its divisors is an integer number (198978408).

Almost surely, 2^663261355 is an apocalyptic number.

663261355 is a deficient number, since it is larger than the sum of its proper divisors (132652277).

663261355 is a wasteful number, since it uses less digits than its factorization.

663261355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132652276.

The product of its digits is 97200, while the sum is 37.

The square root of 663261355 is about 25753.8609726775. The cubic root of 663261355 is about 872.0905181088.

The spelling of 663261355 in words is "six hundred sixty-three million, two hundred sixty-one thousand, three hundred fifty-five".