261646246657219 has 2 divisors, whose sum is σ = 261646246657220. Its totient is φ = 261646246657218.

The previous prime is 261646246657177. The next prime is 261646246657249. The reversal of 261646246657219 is 912756642646162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261646246657219 - 2²¹ = 261646244560067 is a prime.

It is a super-2 number, since 2×261646246657219² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261646246657249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130823123328609 + 130823123328610.

It is an arithmetic number, because the mean of its divisors is an integer number (130823123328610).

Almost surely, 2^{261646246657219} is an apocalyptic number.

261646246657219 is a deficient number, since it is larger than the sum of its proper divisors (1).

261646246657219 is an equidigital number, since it uses as much as digits as its factorization.

261646246657219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 313528320, while the sum is 67.

The spelling of 261646246657219 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-six million, six hundred fifty-seven thousand, two hundred nineteen".