1663978080 has 48 divisors (see below), whose sum is σ = 5241532464. Its totient is φ = 443727360.

The previous prime is 1663978073. The next prime is 1663978091. The reversal of 1663978080 is 808793661.

It is a tau number, because it is divible by the number of its divisors (48).

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1732831 + ... + 1733790.

It is an arithmetic number, because the mean of its divisors is an integer number (109198593).

Almost surely, 2^1663978080 is an apocalyptic number.

1663978080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663978080 is an abundant number, since it is smaller than the sum of its proper divisors (3577554384).

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

1663978080 is a wasteful number, since it uses less digits than its factorization.

1663978080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466639 (or 3466631 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 1663978080 is about 40791.8874287523. The cubic root of 1663978080 is about 1184.9932239816.

The spelling of 1663978080 in words is "one billion, six hundred sixty-three million, nine hundred seventy-eight thousand, eighty".