256106263680 has 384 divisors, whose sum is σ = 907022188800. Its totient is φ = 66557952000.

The previous prime is 256106263669. The next prime is 256106263697. The reversal of 256106263680 is 86362601652.

256106263680 is a `hidden beast` number, since 2 + 5 + 6 + 1 + 0 + 6 + 2 + 636 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×256106263680² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67948836 + ... + 67952604.

It is an arithmetic number, because the mean of its divisors is an integer number (2362036950).

Almost surely, 2^256106263680 is an apocalyptic number.

256106263680 is a gapful number since it is divisible by the number (20) 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 256106263680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453511094400).

256106263680 is an abundant number, since it is smaller than the sum of its proper divisors (650915925120).

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

256106263680 is a wasteful number, since it uses less digits than its factorization.

256106263680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092 (or 4077 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 256106263680 in words is "two hundred fifty-six billion, one hundred six million, two hundred sixty-three thousand, six hundred eighty".