255785732021 has 12 divisors (see below), whose sum is σ = 259192732644. Its totient is φ = 252422227200.

The previous prime is 255785731979. The next prime is 255785732051. The reversal of 255785732021 is 120237587552.

255785732021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 38363098225 + 217422633796 = 195865^2 + 466286^2 .

It is not a de Polignac number, because 255785732021 - 2²² = 255781537717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255785732051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4095851 + ... + 4157831.

It is an arithmetic number, because the mean of its divisors is an integer number (21599394387).

Almost surely, 2^255785732021 is an apocalyptic number.

It is an amenable number.

255785732021 is a deficient number, since it is larger than the sum of its proper divisors (3407000623).

255785732021 is an frugal number, since it uses more digits than its factorization.

255785732021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62680 (or 62591 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 47.

The spelling of 255785732021 in words is "two hundred fifty-five billion, seven hundred eighty-five million, seven hundred thirty-two thousand, twenty-one".