1663342776 has 144 divisors (see below), whose sum is σ = 4797865800. Its totient is φ = 539861760.

The previous prime is 1663342753. The next prime is 1663342799. The reversal of 1663342776 is 6772433661.

1663342776 is a `hidden beast` number, since 1 + 6 + 633 + 4 + 2 + 7 + 7 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (1663342753) and next prime (1663342799).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 3267610 + ... + 3268118.

Almost surely, 2^1663342776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663342776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2398932900).

1663342776 is an abundant number, since it is smaller than the sum of its proper divisors (3134523024).

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

1663342776 is an equidigital number, since it uses as much as digits as its factorization.

1663342776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612 (or 555 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The square root of 1663342776 is about 40784.0995487212. The cubic root of 1663342776 is about 1184.8423953190.

The spelling of 1663342776 in words is "one billion, six hundred sixty-three million, three hundred forty-two thousand, seven hundred seventy-six".