1256320016 has 60 divisors (see below), whose sum is σ = 2836247040. Its totient is φ = 537526080.

The previous prime is 1256319989. The next prime is 1256320057. The reversal of 1256320016 is 6100236521.

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 11 ways as a sum of consecutive naturals, for example, 713345 + ... + 715103.

It is an arithmetic number, because the mean of its divisors is an integer number (47270784).

Almost surely, 2^1256320016 is an apocalyptic number.

1256320016 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 1256320016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1418123520).

1256320016 is an abundant number, since it is smaller than the sum of its proper divisors (1579927024).

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

1256320016 is a wasteful number, since it uses less digits than its factorization.

1256320016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692 (or 2679 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1256320016 is about 35444.6048927055. The cubic root of 1256320016 is about 1079.0297687883.

Adding to 1256320016 its reverse (6100236521), we get a palindrome (7356556537).

The spelling of 1256320016 in words is "one billion, two hundred fifty-six million, three hundred twenty thousand, sixteen".