261160066321 has 16 divisors (see below), whose sum is σ = 325616128128. Its totient is φ = 203492620800.

The previous prime is 261160066301. The next prime is 261160066333. The reversal of 261160066321 is 123660061162.

It is not a de Polignac number, because 261160066321 - 2⁵ = 261160066289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261160066301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2186611 + ... + 2302951.

It is an arithmetic number, because the mean of its divisors is an integer number (20351008008).

Almost surely, 2^261160066321 is an apocalyptic number.

It is an amenable number.

261160066321 is a deficient number, since it is larger than the sum of its proper divisors (64456061807).

261160066321 is a wasteful number, since it uses less digits than its factorization.

261160066321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145512.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 261160066321 in words is "two hundred sixty-one billion, one hundred sixty million, sixty-six thousand, three hundred twenty-one".