256564564743480 has 128 divisors (see below), whose sum is σ = 879689126131200. Its totient is φ = 58640716426752.

The previous prime is 256564564743437. The next prime is 256564564743491. The reversal of 256564564743480 is 84347465465652.

It is a super-2 number, since 2×256564564743480² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12093166 + ... + 25678274.

It is an arithmetic number, because the mean of its divisors is an integer number (6872571297900).

Almost surely, 2^{256564564743480} is an apocalyptic number.

256564564743480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256564564743480 is an abundant number, since it is smaller than the sum of its proper divisors (623124561387720).

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

256564564743480 is a wasteful number, since it uses less digits than its factorization.

256564564743480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13607613 (or 13607609 counting only the distinct ones).

The product of its (nonzero) digits is 2322432000, while the sum is 69.

The spelling of 256564564743480 in words is "two hundred fifty-six trillion, five hundred sixty-four billion, five hundred sixty-four million, seven hundred forty-three thousand, four hundred eighty".