1663375842 has 18 divisors (see below), whose sum is σ = 3604355937. Its totient is φ = 554400936.

The previous prime is 1663375817. The next prime is 1663375867. The reversal of 1663375842 is 2485733661.

1663375842 is a `hidden beast` number, since 1 + 6 + 63 + 3 + 7 + 584 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1663375817) and next prime (1663375867).

It can be written as a sum of positive squares in 2 ways, for example, as 933241401 + 730134441 = 30549^2 + 27021^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=28839.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 168228 + ... + 177840.

Almost surely, 2^1663375842 is an apocalyptic number.

1663375842 is an abundant number, since it is smaller than the sum of its proper divisors (1940980095).

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

1663375842 is an frugal number, since it uses more digits than its factorization.

1663375842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19234 (or 9618 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 1663375842 is about 40784.5049252777. The cubic root of 1663375842 is about 1184.8502465247.

The spelling of 1663375842 in words is "one billion, six hundred sixty-three million, three hundred seventy-five thousand, eight hundred forty-two".