261535123241610 has 32 divisors (see below), whose sum is σ = 628533665651520. Its totient is φ = 69648325100928.

The previous prime is 261535123241549. The next prime is 261535123241611. The reversal of 261535123241610 is 16142321535162.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261535123241611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5898379347 + ... + 5898423686.

It is an arithmetic number, because the mean of its divisors is an integer number (19641677051610).

Almost surely, 2^{261535123241610} is an apocalyptic number.

261535123241610 is an abundant number, since it is smaller than the sum of its proper divisors (366998542409910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261535123241610 is a wasteful number, since it uses less digits than its factorization.

261535123241610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11796803782.

The product of its (nonzero) digits is 259200, while the sum is 42.

Adding to 261535123241610 its reverse (16142321535162), we get a palindrome (277677444776772).

The spelling of 261535123241610 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, one hundred twenty-three million, two hundred forty-one thousand, six hundred ten".