1556664016 has 20 divisors (see below), whose sum is σ = 3017359332. Its totient is φ = 777990656.

The previous prime is 1556663993. The next prime is 1556664073. The reversal of 1556664016 is 6104666551.

It can be written as a sum of positive squares in 2 ways, for example, as 1444304016 + 112360000 = 38004^2 + 10600^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1556664016.

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, 18546 + ... + 58798.

Almost surely, 2^1556664016 is an apocalyptic number.

1556664016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1556664016 is a deficient number, since it is larger than the sum of its proper divisors (1460695316).

1556664016 is a wasteful number, since it uses less digits than its factorization.

1556664016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42678 (or 42672 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1556664016 is about 39454.5816857814. The cubic root of 1556664016 is about 1158.9506999527.

The spelling of 1556664016 in words is "one billion, five hundred fifty-six million, six hundred sixty-four thousand, sixteen".