665888442 has 16 divisors (see below), whose sum is σ = 1337085792. Its totient is φ = 221078000.

The previous prime is 665888441. The next prime is 665888467. The reversal of 665888442 is 244888566.

It is not an unprimeable number, because it can be changed into a prime (665888441) 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, 219573 + ... + 222584.

It is an arithmetic number, because the mean of its divisors is an integer number (83567862).

Almost surely, 2^665888442 is an apocalyptic number.

665888442 is an abundant number, since it is smaller than the sum of its proper divisors (671197350).

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

665888442 is a wasteful number, since it uses less digits than its factorization.

665888442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442413.

The product of its digits is 2949120, while the sum is 51.

The square root of 665888442 is about 25804.8143182624. The cubic root of 665888442 is about 873.2404114500.

The spelling of 665888442 in words is "six hundred sixty-five million, eight hundred eighty-eight thousand, four hundred forty-two".