261156100507 has 2 divisors, whose sum is σ = 261156100508. Its totient is φ = 261156100506.

The previous prime is 261156100441. The next prime is 261156100523. The reversal of 261156100507 is 705001651162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261156100507 - 2¹⁹ = 261155576219 is a prime.

It is not a weakly prime, because it can be changed into another prime (261156100567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130578050253 + 130578050254.

It is an arithmetic number, because the mean of its divisors is an integer number (130578050254).

Almost surely, 2^261156100507 is an apocalyptic number.

261156100507 is a deficient number, since it is larger than the sum of its proper divisors (1).

261156100507 is an equidigital number, since it uses as much as digits as its factorization.

261156100507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

Adding to 261156100507 its reverse (705001651162), we get a palindrome (966157751669).

The spelling of 261156100507 in words is "two hundred sixty-one billion, one hundred fifty-six million, one hundred thousand, five hundred seven".