1656666318 has 8 divisors (see below), whose sum is σ = 3313332648. Its totient is φ = 552222104.

The previous prime is 1656666313. The next prime is 1656666353. The reversal of 1656666318 is 8136666561.

It is a happy number.

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

1656666318 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656666313) 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, 138055521 + ... + 138055532.

It is an arithmetic number, because the mean of its divisors is an integer number (414166581).

Almost surely, 2^1656666318 is an apocalyptic number.

1656666318 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1656666318 is a wasteful number, since it uses less digits than its factorization.

1656666318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276111058.

The product of its digits is 933120, while the sum is 48.

The square root of 1656666318 is about 40702.1660111597. The cubic root of 1656666318 is about 1183.2549978870.

The spelling of 1656666318 in words is "one billion, six hundred fifty-six million, six hundred sixty-six thousand, three hundred eighteen".