261441545331066 has 64 divisors (see below), whose sum is σ = 568731522662400. Its totient is φ = 79816622529600.

The previous prime is 261441545331049. The next prime is 261441545331073. The reversal of 261441545331066 is 660133545144162.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33823201 + ... + 40827588.

It is an arithmetic number, because the mean of its divisors is an integer number (8886430041600).

Almost surely, 2^{261441545331066} is an apocalyptic number.

261441545331066 is an abundant number, since it is smaller than the sum of its proper divisors (307289977331334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261441545331066 is a wasteful number, since it uses less digits than its factorization.

261441545331066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74651835.

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 261441545331066 in words is "two hundred sixty-one trillion, four hundred forty-one billion, five hundred forty-five million, three hundred thirty-one thousand, sixty-six".