1656663018 has 16 divisors (see below), whose sum is σ = 3323161920. Its totient is φ = 550581696.

The previous prime is 1656663011. The next prime is 1656663031. The reversal of 1656663018 is 8103666561.

It is not an unprimeable number, because it can be changed into a prime (1656663011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 407638 + ... + 411681.

It is an arithmetic number, because the mean of its divisors is an integer number (207697620).

Almost surely, 2^1656663018 is an apocalyptic number.

1656663018 is an abundant number, since it is smaller than the sum of its proper divisors (1666498902).

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

1656663018 is a wasteful number, since it uses less digits than its factorization.

1656663018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819661.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1656663018 is about 40702.1254727563. The cubic root of 1656663018 is about 1183.2542122240.

The spelling of 1656663018 in words is "one billion, six hundred fifty-six million, six hundred sixty-three thousand, eighteen".