1326655616 has 128 divisors (see below), whose sum is σ = 3135888000. Its totient is φ = 555709440.

The previous prime is 1326655597. The next prime is 1326655669. The reversal of 1326655616 is 6165566231.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2214485 + ... + 2215083.

It is an arithmetic number, because the mean of its divisors is an integer number (24499125).

Almost surely, 2^1326655616 is an apocalyptic number.

1326655616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1326655616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1567944000).

1326655616 is an abundant number, since it is smaller than the sum of its proper divisors (1809232384).

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

1326655616 is an equidigital number, since it uses as much as digits as its factorization.

1326655616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 625 counting only the distinct ones).

The product of its digits is 194400, while the sum is 41.

The square root of 1326655616 is about 36423.2839815413. The cubic root of 1326655616 is about 1098.8018955153.

The spelling of 1326655616 in words is "one billion, three hundred twenty-six million, six hundred fifty-five thousand, six hundred sixteen".