261413433505 has 8 divisors (see below), whose sum is σ = 358509851712. Its totient is φ = 179254925808.

The previous prime is 261413433487. The next prime is 261413433559. The reversal of 261413433505 is 505334314162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261413433505 - 2⁵ = 261413433473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3734477587 + ... + 3734477656.

It is an arithmetic number, because the mean of its divisors is an integer number (44813731464).

Almost surely, 2^261413433505 is an apocalyptic number.

It is an amenable number.

261413433505 is a deficient number, since it is larger than the sum of its proper divisors (97096418207).

261413433505 is an equidigital number, since it uses as much as digits as its factorization.

261413433505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468955255.

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 261413433505 its reverse (505334314162), we get a palindrome (766747747667).

The spelling of 261413433505 in words is "two hundred sixty-one billion, four hundred thirteen million, four hundred thirty-three thousand, five hundred five".