663271172365 has 8 divisors (see below), whose sum is σ = 796445288928. Its totient is φ = 530270349840.

The previous prime is 663271172359. The next prime is 663271172437. The reversal of 663271172365 is 563271172366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663271172365 - 2¹⁹ = 663270648077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43315087 + ... + 43330396.

It is an arithmetic number, because the mean of its divisors is an integer number (99555661116).

Almost surely, 2^663271172365 is an apocalyptic number.

It is an amenable number.

663271172365 is a deficient number, since it is larger than the sum of its proper divisors (133174116563).

663271172365 is a wasteful number, since it uses less digits than its factorization.

663271172365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86647019.

The product of its digits is 1905120, while the sum is 49.

Subtracting from 663271172365 its reverse (563271172366), we obtain a palindrome (99999999999).

It can be divided in two parts, 6632711 and 72365, that added together give a palindrome (6705076).

The spelling of 663271172365 in words is "six hundred sixty-three billion, two hundred seventy-one million, one hundred seventy-two thousand, three hundred sixty-five".