1663494720 has 112 divisors (see below), whose sum is σ = 5452067328. Its totient is φ = 429281280.

The previous prime is 1663494691. The next prime is 1663494733. The reversal of 1663494720 is 274943661.

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 15 ways as a sum of consecutive naturals, for example, 1812 + ... + 57708.

Almost surely, 2^1663494720 is an apocalyptic number.

1663494720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663494720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2726033664).

1663494720 is an abundant number, since it is smaller than the sum of its proper divisors (3788572608).

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

1663494720 is a wasteful number, since it uses less digits than its factorization.

1663494720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55948 (or 55938 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 1663494720 is about 40785.9622909648. The cubic root of 1663494720 is about 1184.8784721105.

The spelling of 1663494720 in words is "one billion, six hundred sixty-three million, four hundred ninety-four thousand, seven hundred twenty".