1663490960 has 20 divisors (see below), whose sum is σ = 3867616668. Its totient is φ = 665396352.

The previous prime is 1663490957. The next prime is 1663490963. The reversal of 1663490960 is 690943661.

It is an interprime number because it is at equal distance from previous prime (1663490957) and next prime (1663490963).

It can be written as a sum of positive squares in 2 ways, for example, as 427827856 + 1235663104 = 20684^2 + 35152^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1663490963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10396739 + ... + 10396898.

Almost surely, 2^1663490960 is an apocalyptic number.

1663490960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663490960 is an abundant number, since it is smaller than the sum of its proper divisors (2204125708).

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

1663490960 is a wasteful number, since it uses less digits than its factorization.

1663490960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793650 (or 20793644 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 1663490960 is about 40785.9161966481. The cubic root of 1663490960 is about 1184.8775793822.

The spelling of 1663490960 in words is "one billion, six hundred sixty-three million, four hundred ninety thousand, nine hundred sixty".