1663878875 has 8 divisors (see below), whose sum is σ = 2076520992. Its totient is φ = 1331103000.

The previous prime is 1663878869. The next prime is 1663878889. The reversal of 1663878875 is 5788783661.

It is a happy number.

It is not a de Polignac number, because 1663878875 - 2²² = 1659684571 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6655391 + ... + 6655640.

It is an arithmetic number, because the mean of its divisors is an integer number (259565124).

Almost surely, 2^1663878875 is an apocalyptic number.

1663878875 is a deficient number, since it is larger than the sum of its proper divisors (412642117).

1663878875 is an equidigital number, since it uses as much as digits as its factorization.

1663878875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13311046 (or 13311036 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 59.

The square root of 1663878875 is about 40790.6714212944. The cubic root of 1663878875 is about 1184.9696740742.

The spelling of 1663878875 in words is "one billion, six hundred sixty-three million, eight hundred seventy-eight thousand, eight hundred seventy-five".