665618442 has 48 divisors (see below), whose sum is σ = 1420403040. Its totient is φ = 207899392.

The previous prime is 665618441. The next prime is 665618479. The reversal of 665618442 is 244816566.

It is a junction number, because it is equal to n+sod(n) for n = 665618394 and 665618403.

It is not an unprimeable number, because it can be changed into a prime (665618441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 465733 + ... + 467159.

It is an arithmetic number, because the mean of its divisors is an integer number (29591730).

Almost surely, 2^665618442 is an apocalyptic number.

665618442 is an abundant number, since it is smaller than the sum of its proper divisors (754784598).

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

665618442 is a wasteful number, since it uses less digits than its factorization.

665618442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735 (or 1718 counting only the distinct ones).

The product of its digits is 276480, while the sum is 42.

The square root of 665618442 is about 25799.5822059195. The cubic root of 665618442 is about 873.1223702637.

The spelling of 665618442 in words is "six hundred sixty-five million, six hundred eighteen thousand, four hundred forty-two".