665766242 has 8 divisors (see below), whose sum is σ = 1002335232. Its totient is φ = 331654500.

The previous prime is 665766239. The next prime is 665766247. The reversal of 665766242 is 242667566.

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 = 665766193 and 665766202.

It is not an unprimeable number, because it can be changed into a prime (665766247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613634 + ... + 614717.

It is an arithmetic number, because the mean of its divisors is an integer number (125291904).

Almost surely, 2^665766242 is an apocalyptic number.

665766242 is a deficient number, since it is larger than the sum of its proper divisors (336568990).

665766242 is a wasteful number, since it uses less digits than its factorization.

665766242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228624.

The product of its digits is 725760, while the sum is 44.

The square root of 665766242 is about 25802.4464343984. The cubic root of 665766242 is about 873.1869908369.

The spelling of 665766242 in words is "six hundred sixty-five million, seven hundred sixty-six thousand, two hundred forty-two".