256730549922 has 450 divisors, whose sum is σ = 752096848635. Its totient is φ = 65264466960.

The previous prime is 256730549921. The next prime is 256730549947. The reversal of 256730549922 is 229945037652.

256730549922 is a `hidden beast` number, since 2 + 5 + 6 + 7 + 3 + 0 + 549 + 92 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128365274961 + 128365274961 = 358281^2 + 358281^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=358281.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (256730549921) by changing a digit.

It is a polite number, since it can be written in 224 ways as a sum of consecutive naturals, for example, 5462352103 + ... + 5462352149.

Almost surely, 2^256730549922 is an apocalyptic number.

256730549922 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 256730549922

256730549922 is an abundant number, since it is smaller than the sum of its proper divisors (495366298713).

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

256730549922 is an frugal number, since it uses more digits than its factorization.

256730549922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 54.

The spelling of 256730549922 in words is "two hundred fifty-six billion, seven hundred thirty million, five hundred forty-nine thousand, nine hundred twenty-two".