255207842761 has 3 divisors (see below), whose sum is σ = 255208347943. Its totient is φ = 255207337580.

The previous prime is 255207842719. The next prime is 255207842803. The reversal of 255207842761 is 167248702552.

The square root of 255207842761 is 505181.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (255207842719) and next prime (255207842803).

It can be written as a sum of positive squares in only one way, i.e., 250181032761 + 5026810000 = 500181^2 + 70900^2 .

It is not a de Polignac number, because 255207842761 - 2¹⁹ = 255207318473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255207842711) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 252591 + ... + 757771.

Almost surely, 2^255207842761 is an apocalyptic number.

255207842761 is the 505181-st square number.

255207842761 is the 252591-st centered octagonal number.

It is an amenable number.

255207842761 is a deficient number, since it is larger than the sum of its proper divisors (505182).

255207842761 is an frugal number, since it uses more digits than its factorization.

255207842761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010362 (or 505181 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 49.

Multiplying 255207842761 by its sum of digits (49), we get a square (12505184295289 = 3536267²).

The spelling of 255207842761 in words is "two hundred fifty-five billion, two hundred seven million, eight hundred forty-two thousand, seven hundred sixty-one".