666615542 has 8 divisors (see below), whose sum is σ = 1000597536. Its totient is φ = 333083032.

The previous prime is 666615539. The next prime is 666615553. The reversal of 666615542 is 245516666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 666615542.

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, 108638 + ... + 114609.

It is an arithmetic number, because the mean of its divisors is an integer number (125074692).

Almost surely, 2^666615542 is an apocalyptic number.

666615542 is a deficient number, since it is larger than the sum of its proper divisors (333981994).

666615542 is a wasteful number, since it uses less digits than its factorization.

666615542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224742.

The product of its digits is 259200, while the sum is 41.

The square root of 666615542 is about 25818.8989308220. The cubic root of 666615542 is about 873.5581334104.

The spelling of 666615542 in words is "six hundred sixty-six million, six hundred fifteen thousand, five hundred forty-two".