1663205400 has 120 divisors (see below), whose sum is σ = 5776615020. Its totient is φ = 443517120.

The previous prime is 1663205381. The next prime is 1663205429. The reversal of 1663205400 is 45023661.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 35134 + ... + 67533.

Almost surely, 2^1663205400 is an apocalyptic number.

1663205400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663205400 is an abundant number, since it is smaller than the sum of its proper divisors (4113409620).

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

1663205400 is a wasteful number, since it uses less digits than its factorization.

1663205400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102695 (or 102677 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1663205400 is about 40782.4153281779. The cubic root of 1663205400 is about 1184.8097755863.

The spelling of 1663205400 in words is "one billion, six hundred sixty-three million, two hundred five thousand, four hundred".