665679542 has 8 divisors (see below), whose sum is σ = 1089293832. Its totient is φ = 302581600.

The previous prime is 665679533. The next prime is 665679551. The reversal of 665679542 is 245976566.

It is an interprime number because it is at equal distance from previous prime (665679533) and next prime (665679551).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15129059 + ... + 15129102.

It is an arithmetic number, because the mean of its divisors is an integer number (136161729).

Almost surely, 2^665679542 is an apocalyptic number.

665679542 is a deficient number, since it is larger than the sum of its proper divisors (423614290).

665679542 is a wasteful number, since it uses less digits than its factorization.

665679542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30258174.

The product of its digits is 2721600, while the sum is 50.

The square root of 665679542 is about 25800.7663064491. The cubic root of 665679542 is about 873.1490853410.

The spelling of 665679542 in words is "six hundred sixty-five million, six hundred seventy-nine thousand, five hundred forty-two".