67256777856 has 128 divisors (see below), whose sum is σ = 184454645760. Its totient is φ = 21699256320.

The previous prime is 67256777843. The next prime is 67256777909. The reversal of 67256777856 is 65877765276.

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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1982670 + ... + 2016306.

It is an arithmetic number, because the mean of its divisors is an integer number (1441051920).

Almost surely, 2^67256777856 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 67256777856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92227322880).

67256777856 is an abundant number, since it is smaller than the sum of its proper divisors (117197867904).

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

67256777856 is a wasteful number, since it uses less digits than its factorization.

67256777856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33822 (or 33810 counting only the distinct ones).

The product of its digits is 207446400, while the sum is 66.

The spelling of 67256777856 in words is "sixty-seven billion, two hundred fifty-six million, seven hundred seventy-seven thousand, eight hundred fifty-six".