261154253447 has 2 divisors, whose sum is σ = 261154253448. Its totient is φ = 261154253446.

The previous prime is 261154253429. The next prime is 261154253489. The reversal of 261154253447 is 744352451162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261154253447 - 2²⁴ = 261137476231 is a prime.

It is a super-3 number, since 3×261154253447³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 261154253398 and 261154253407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261154253497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130577126723 + 130577126724.

It is an arithmetic number, because the mean of its divisors is an integer number (130577126724).

Almost surely, 2^261154253447 is an apocalyptic number.

261154253447 is a deficient number, since it is larger than the sum of its proper divisors (1).

261154253447 is an equidigital number, since it uses as much as digits as its factorization.

261154253447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 44.

The spelling of 261154253447 in words is "two hundred sixty-one billion, one hundred fifty-four million, two hundred fifty-three thousand, four hundred forty-seven".