261530627949 has 12 divisors (see below), whose sum is σ = 377845505856. Its totient is φ = 174317270472.

The previous prime is 261530627921. The next prime is 261530627957. The reversal of 261530627949 is 949726035162.

261530627949 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 3 + 0 + 627 + 9 + 4 + 9 = 666.

It is not a de Polignac number, because 261530627949 - 2¹¹ = 261530625901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261530627895 and 261530627904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261530627959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2994687 + ... + 3080780.

It is an arithmetic number, because the mean of its divisors is an integer number (31487125488).

Almost surely, 2^261530627949 is an apocalyptic number.

It is an amenable number.

261530627949 is a deficient number, since it is larger than the sum of its proper divisors (116314877907).

261530627949 is a wasteful number, since it uses less digits than its factorization.

261530627949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080256 (or 6080253 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 261530627949 in words is "two hundred sixty-one billion, five hundred thirty million, six hundred twenty-seven thousand, nine hundred forty-nine".