261432135141625 has 64 divisors (see below), whose sum is σ = 396430262332416. Its totient is φ = 168238150080000.

The previous prime is 261432135141607. The next prime is 261432135141673. The reversal of 261432135141625 is 526141531234162.

It is a happy number.

It is not a de Polignac number, because 261432135141625 - 2¹¹ = 261432135139577 is a prime.

It is a super-2 number, since 2×261432135141625² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121484476 + ... + 123617725.

It is an arithmetic number, because the mean of its divisors is an integer number (6194222848944).

Almost surely, 2^{261432135141625} is an apocalyptic number.

261432135141625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261432135141625 is a deficient number, since it is larger than the sum of its proper divisors (134998127190791).

261432135141625 is a wasteful number, since it uses less digits than its factorization.

261432135141625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245102299 (or 245102289 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

Adding to 261432135141625 its reverse (526141531234162), we get a palindrome (787573666375787).

The spelling of 261432135141625 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, one hundred thirty-five million, one hundred forty-one thousand, six hundred twenty-five".