665398142 has 8 divisors (see below), whose sum is σ = 1041492816. Its totient is φ = 318233872.

The previous prime is 665398109. The next prime is 665398159. The reversal of 665398142 is 241893566.

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

It is a junction number, because it is equal to n+sod(n) for n = 665398093 and 665398102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7232543 + ... + 7232634.

It is an arithmetic number, because the mean of its divisors is an integer number (130186602).

Almost surely, 2^665398142 is an apocalyptic number.

665398142 is a deficient number, since it is larger than the sum of its proper divisors (376094674).

665398142 is a wasteful number, since it uses less digits than its factorization.

665398142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14465202.

The product of its digits is 311040, while the sum is 44.

The square root of 665398142 is about 25795.3124036132. The cubic root of 665398142 is about 873.0260337489.

The spelling of 665398142 in words is "six hundred sixty-five million, three hundred ninety-eight thousand, one hundred forty-two".