665563142 has 4 divisors (see below), whose sum is σ = 998344716. Its totient is φ = 332781570.

The previous prime is 665563133. The next prime is 665563169. The reversal of 665563142 is 241365566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 665563096 and 665563105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166390784 + ... + 166390787.

It is an arithmetic number, because the mean of its divisors is an integer number (249586179).

Almost surely, 2^665563142 is an apocalyptic number.

665563142 is a deficient number, since it is larger than the sum of its proper divisors (332781574).

665563142 is a wasteful number, since it uses less digits than its factorization.

665563142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332781573.

The product of its digits is 129600, while the sum is 38.

The square root of 665563142 is about 25798.5104608774. The cubic root of 665563142 is about 873.0981897416.

The spelling of 665563142 in words is "six hundred sixty-five million, five hundred sixty-three thousand, one hundred forty-two".