261410260165 has 8 divisors (see below), whose sum is σ = 317663101440. Its totient is φ = 206481015312.

The previous prime is 261410260121. The next prime is 261410260169. The reversal of 261410260165 is 561062014162.

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

It is a cyclic number.

It is not a de Polignac number, because 261410260165 - 2³¹ = 259262776517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261410260165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261410260169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330898669 + ... + 330899458.

It is an arithmetic number, because the mean of its divisors is an integer number (39707887680).

Almost surely, 2^261410260165 is an apocalyptic number.

It is an amenable number.

261410260165 is a deficient number, since it is larger than the sum of its proper divisors (56252841275).

261410260165 is an equidigital number, since it uses as much as digits as its factorization.

261410260165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661798211.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 261410260165 in words is "two hundred sixty-one billion, four hundred ten million, two hundred sixty thousand, one hundred sixty-five".