256724635021572 has 24 divisors (see below), whose sum is σ = 634260862994976. Its totient is φ = 80541061967488.

The previous prime is 256724635021571. The next prime is 256724635021601. The reversal of 256724635021572 is 275120536427652.

It is a super-3 number, since 3×256724635021572³ (a number of 44 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (256724635021571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629227046418 + ... + 629227046825.

It is an arithmetic number, because the mean of its divisors is an integer number (26427535958124).

Almost surely, 2^{256724635021572} is an apocalyptic number.

It is an amenable number.

256724635021572 is an abundant number, since it is smaller than the sum of its proper divisors (377536227973404).

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

256724635021572 is a wasteful number, since it uses less digits than its factorization.

256724635021572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258454093267 (or 1258454093265 counting only the distinct ones).

The product of its (nonzero) digits is 42336000, while the sum is 57.

The spelling of 256724635021572 in words is "two hundred fifty-six trillion, seven hundred twenty-four billion, six hundred thirty-five million, twenty-one thousand, five hundred seventy-two".