261328614743719 has 2 divisors, whose sum is σ = 261328614743720. Its totient is φ = 261328614743718.

The previous prime is 261328614743711. The next prime is 261328614743731. The reversal of 261328614743719 is 917347416823162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261328614743719 - 2³ = 261328614743711 is a prime.

It is a super-2 number, since 2×261328614743719² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261328614743711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130664307371859 + 130664307371860.

It is an arithmetic number, because the mean of its divisors is an integer number (130664307371860).

Almost surely, 2^{261328614743719} is an apocalyptic number.

261328614743719 is a deficient number, since it is larger than the sum of its proper divisors (1).

261328614743719 is an equidigital number, since it uses as much as digits as its factorization.

261328614743719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 64.

The spelling of 261328614743719 in words is "two hundred sixty-one trillion, three hundred twenty-eight billion, six hundred fourteen million, seven hundred forty-three thousand, seven hundred nineteen".