1663722920 has 32 divisors (see below), whose sum is σ = 3823027200. Its totient is φ = 651329088.

The previous prime is 1663722919. The next prime is 1663722937. The reversal of 1663722920 is 292273661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440600 + ... + 444359.

It is an arithmetic number, because the mean of its divisors is an integer number (119469600).

Almost surely, 2^1663722920 is an apocalyptic number.

1663722920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663722920 is an abundant number, since it is smaller than the sum of its proper divisors (2159304280).

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

1663722920 is a wasteful number, since it uses less digits than its factorization.

1663722920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885017 (or 885013 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 1663722920 is about 40788.7597261795. The cubic root of 1663722920 is about 1184.9326506021.

The spelling of 1663722920 in words is "one billion, six hundred sixty-three million, seven hundred twenty-two thousand, nine hundred twenty".