261414847649 has 2 divisors, whose sum is σ = 261414847650. Its totient is φ = 261414847648.

The previous prime is 261414847549. The next prime is 261414847657. The reversal of 261414847649 is 946748414162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261269211025 + 145636624 = 511145^2 + 12068^2 .

It is a cyclic number.

It is not a de Polignac number, because 261414847649 - 2²⁸ = 261146412193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261414847594 and 261414847603.

It is not a weakly prime, because it can be changed into another prime (261414847699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130707423824 + 130707423825.

It is an arithmetic number, because the mean of its divisors is an integer number (130707423825).

Almost surely, 2^261414847649 is an apocalyptic number.

It is an amenable number.

261414847649 is a deficient number, since it is larger than the sum of its proper divisors (1).

261414847649 is an equidigital number, since it uses as much as digits as its factorization.

261414847649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 56.

The spelling of 261414847649 in words is "two hundred sixty-one billion, four hundred fourteen million, eight hundred forty-seven thousand, six hundred forty-nine".