261432020126161 has 8 divisors (see below), whose sum is σ = 265961575764000. Its totient is φ = 256905747970080.

The previous prime is 261432020126159. The next prime is 261432020126191. The reversal of 261432020126161 is 161621020234162.

261432020126161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 261432020126161 - 2¹ = 261432020126159 is a prime.

It is a super-2 number, since 2×261432020126161² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261432020126161.

It is not an unprimeable number, because it can be changed into a prime (261432020126111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820709820 + ... + 821028301.

It is an arithmetic number, because the mean of its divisors is an integer number (33245196970500).

Almost surely, 2^{261432020126161} is an apocalyptic number.

It is an amenable number.

261432020126161 is a deficient number, since it is larger than the sum of its proper divisors (4529555637839).

261432020126161 is a wasteful number, since it uses less digits than its factorization.

261432020126161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641740879.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 261432020126161 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, twenty million, one hundred twenty-six thousand, one hundred sixty-one".