1663400800 has 36 divisors (see below), whose sum is σ = 4060779156. Its totient is φ = 665360000.

The previous prime is 1663400737. The next prime is 1663400803. The reversal of 1663400800 is 80043661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663400803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1038826 + ... + 1040425.

It is an arithmetic number, because the mean of its divisors is an integer number (112799421).

Almost surely, 2^1663400800 is an apocalyptic number.

1663400800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663400800 is an abundant number, since it is smaller than the sum of its proper divisors (2397378356).

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

1663400800 is a wasteful number, since it uses less digits than its factorization.

1663400800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079271 (or 2079258 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1663400800 is about 40784.8108981763. The cubic root of 1663400800 is about 1184.8561724944.

The spelling of 1663400800 in words is "one billion, six hundred sixty-three million, four hundred thousand, eight hundred".