1663166784 has 28 divisors (see below), whose sum is σ = 4400462624. Its totient is φ = 554388864.

The previous prime is 1663166779. The next prime is 1663166803. The reversal of 1663166784 is 4876613661.

It is a super-2 number, since 2×1663166784² = 5532247502801805312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4330972 + ... + 4331355.

Almost surely, 2^1663166784 is an apocalyptic number.

It is an amenable number.

1663166784 is an abundant number, since it is smaller than the sum of its proper divisors (2737295840).

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

1663166784 is an equidigital number, since it uses as much as digits as its factorization.

1663166784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662342 (or 8662332 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 1663166784 is about 40781.9418860848. The cubic root of 1663166784 is about 1184.8006059495.

The spelling of 1663166784 in words is "one billion, six hundred sixty-three million, one hundred sixty-six thousand, seven hundred eighty-four".