261552402512430 has 96 divisors (see below), whose sum is σ = 635434325677440. Its totient is φ = 68901070234560.

The previous prime is 261552402512417. The next prime is 261552402512447. The reversal of 261552402512430 is 34215204255162.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2746803361 + ... + 2746898579.

It is an arithmetic number, because the mean of its divisors is an integer number (6619107559140).

Almost surely, 2^{261552402512430} is an apocalyptic number.

261552402512430 is an abundant number, since it is smaller than the sum of its proper divisors (373881923165010).

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

261552402512430 is a wasteful number, since it uses less digits than its factorization.

261552402512430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108686 (or 108603 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

Adding to 261552402512430 its reverse (34215204255162), we get a palindrome (295767606767592).

The spelling of 261552402512430 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, four hundred two million, five hundred twelve thousand, four hundred thirty".