255815561437 has 2 divisors, whose sum is σ = 255815561438. Its totient is φ = 255815561436.

The previous prime is 255815561401. The next prime is 255815561459. The reversal of 255815561437 is 734165518552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218775094756 + 37040466681 = 467734^2 + 192459^2 .

It is a cyclic number.

It is not a de Polignac number, because 255815561437 - 2¹⁵ = 255815528669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255815561137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127907780718 + 127907780719.

It is an arithmetic number, because the mean of its divisors is an integer number (127907780719).

Almost surely, 2^255815561437 is an apocalyptic number.

It is an amenable number.

255815561437 is a deficient number, since it is larger than the sum of its proper divisors (1).

255815561437 is an equidigital number, since it uses as much as digits as its factorization.

255815561437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040000, while the sum is 52.

The spelling of 255815561437 in words is "two hundred fifty-five billion, eight hundred fifteen million, five hundred sixty-one thousand, four hundred thirty-seven".