255531521305 has 8 divisors (see below), whose sum is σ = 306640660032. Its totient is φ = 204423327408.

The previous prime is 255531521291. The next prime is 255531521309. The reversal of 255531521305 is 503125135552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255531521305 - 2²¹ = 255529424153 is a prime.

It is a super-3 number, since 3×255531521305³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255531521309) 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, 686404 + ... + 991066.

It is an arithmetic number, because the mean of its divisors is an integer number (38330082504).

Almost surely, 2^255531521305 is an apocalyptic number.

It is an amenable number.

255531521305 is a deficient number, since it is larger than the sum of its proper divisors (51109138727).

255531521305 is a wasteful number, since it uses less digits than its factorization.

255531521305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472415.

The product of its (nonzero) digits is 112500, while the sum is 37.

Adding to 255531521305 its reverse (503125135552), we get a palindrome (758656656857).

The spelling of 255531521305 in words is "two hundred fifty-five billion, five hundred thirty-one million, five hundred twenty-one thousand, three hundred five".