261161414405 has 16 divisors (see below), whose sum is σ = 323691475968. Its totient is φ = 202071792000.

The previous prime is 261161414387. The next prime is 261161414447. The reversal of 261161414405 is 504414161162.

It is not a de Polignac number, because 261161414405 - 2¹² = 261161410309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222761 + ... + 756270.

It is an arithmetic number, because the mean of its divisors is an integer number (20230717248).

Almost surely, 2^261161414405 is an apocalyptic number.

It is an amenable number.

261161414405 is a deficient number, since it is larger than the sum of its proper divisors (62530061563).

261161414405 is a wasteful number, since it uses less digits than its factorization.

261161414405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980788.

The product of its (nonzero) digits is 23040, while the sum is 35.

Adding to 261161414405 its reverse (504414161162), we get a palindrome (765575575567).

The spelling of 261161414405 in words is "two hundred sixty-one billion, one hundred sixty-one million, four hundred fourteen thousand, four hundred five".