261026415230113 has 4 divisors (see below), whose sum is σ = 281105370247828. Its totient is φ = 240947460212400.

The previous prime is 261026415230093. The next prime is 261026415230131. The reversal of 261026415230113 is 311032514620162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95138506686609 + 165887908543504 = 9753897^2 + 12879748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261026415230113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261026415230183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10039477508838 + ... + 10039477508863.

It is an arithmetic number, because the mean of its divisors is an integer number (70276342561957).

Almost surely, 2^{261026415230113} is an apocalyptic number.

It is an amenable number.

261026415230113 is a deficient number, since it is larger than the sum of its proper divisors (20078955017715).

261026415230113 is a wasteful number, since it uses less digits than its factorization.

261026415230113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20078955017714.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 261026415230113 its reverse (311032514620162), we get a palindrome (572058929850275).

The spelling of 261026415230113 in words is "two hundred sixty-one trillion, twenty-six billion, four hundred fifteen million, two hundred thirty thousand, one hundred thirteen".