261515264127433 has 2 divisors, whose sum is σ = 261515264127434. Its totient is φ = 261515264127432.

The previous prime is 261515264127427. The next prime is 261515264127437. The reversal of 261515264127433 is 334721462515162.

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., 138224509499664 + 123290754627769 = 11756892^2 + 11103637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261515264127433 is a prime.

It is not a weakly prime, because it can be changed into another prime (261515264127437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130757632063716 + 130757632063717.

It is an arithmetic number, because the mean of its divisors is an integer number (130757632063717).

Almost surely, 2^{261515264127433} is an apocalyptic number.

It is an amenable number.

261515264127433 is a deficient number, since it is larger than the sum of its proper divisors (1).

261515264127433 is an equidigital number, since it uses as much as digits as its factorization.

261515264127433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 52.

The spelling of 261515264127433 in words is "two hundred sixty-one trillion, five hundred fifteen billion, two hundred sixty-four million, one hundred twenty-seven thousand, four hundred thirty-three".