665603448618 has 16 divisors (see below), whose sum is σ = 1334560068000. Its totient is φ = 221308954416.

The previous prime is 665603448583. The next prime is 665603448619. The reversal of 665603448618 is 816844306566.

It is a super-2 number, since 2×665603448618² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665603448619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139712868 + ... + 139717631.

It is an arithmetic number, because the mean of its divisors is an integer number (83410004250).

Almost surely, 2^665603448618 is an apocalyptic number.

665603448618 is an abundant number, since it is smaller than the sum of its proper divisors (668956619382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665603448618 is a wasteful number, since it uses less digits than its factorization.

665603448618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279430901.

The product of its (nonzero) digits is 19906560, while the sum is 57.

The spelling of 665603448618 in words is "six hundred sixty-five billion, six hundred three million, four hundred forty-eight thousand, six hundred eighteen".