1663787960 has 32 divisors (see below), whose sum is σ = 3963731760. Its totient is φ = 626366976.

The previous prime is 1663787903. The next prime is 1663787963. The reversal of 1663787960 is 697873661.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663787963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1222694 + ... + 1224053.

Almost surely, 2^1663787960 is an apocalyptic number.

1663787960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663787960 is an abundant number, since it is smaller than the sum of its proper divisors (2299943800).

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

1663787960 is a wasteful number, since it uses less digits than its factorization.

1663787960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446775 (or 2446771 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 1663787960 is about 40789.5569968589. The cubic root of 1663787960 is about 1184.9480912772.

The spelling of 1663787960 in words is "one billion, six hundred sixty-three million, seven hundred eighty-seven thousand, nine hundred sixty".