1256808016 has 10 divisors (see below), whose sum is σ = 2435065562. Its totient is φ = 628404000.

The previous prime is 1256808013. The next prime is 1256808019. The reversal of 1256808016 is 6108086521.

It is an interprime number because it is at equal distance from previous prime (1256808013) and next prime (1256808019).

It can be written as a sum of positive squares in only one way, i.e., 1036582416 + 220225600 = 32196^2 + 14840^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256808013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39275235 + ... + 39275266.

Almost surely, 2^1256808016 is an apocalyptic number.

1256808016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1256808016 is a deficient number, since it is larger than the sum of its proper divisors (1178257546).

1256808016 is an equidigital number, since it uses as much as digits as its factorization.

1256808016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78550509 (or 78550503 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 1256808016 is about 35451.4882057157. The cubic root of 1256808016 is about 1079.1694620607.

The spelling of 1256808016 in words is "one billion, two hundred fifty-six million, eight hundred eight thousand, sixteen".