1663421700 has 72 divisors (see below), whose sum is σ = 4817101408. Its totient is φ = 443185920.

The previous prime is 1663421693. The next prime is 1663421737. The reversal of 1663421700 is 71243661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 524319 + ... + 527481.

Almost surely, 2^1663421700 is an apocalyptic number.

1663421700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663421700 is an abundant number, since it is smaller than the sum of its proper divisors (3153679708).

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

1663421700 is a wasteful number, since it uses less digits than its factorization.

1663421700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4933 (or 4926 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1663421700 is about 40785.0671202096. The cubic root of 1663421700 is about 1184.8611348964.

The spelling of 1663421700 in words is "one billion, six hundred sixty-three million, four hundred twenty-one thousand, seven hundred".