261440042051272 has 64 divisors (see below), whose sum is σ = 593190358611840. Its totient is φ = 105453550003200.

The previous prime is 261440042051267. The next prime is 261440042051317. The reversal of 261440042051272 is 272150240044162.

It is a happy 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, 80441322 + ... + 83628262.

It is an arithmetic number, because the mean of its divisors is an integer number (9268599353310).

Almost surely, 2^{261440042051272} is an apocalyptic number.

It is an amenable number.

261440042051272 is an abundant number, since it is smaller than the sum of its proper divisors (331750316560568).

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

261440042051272 is a wasteful number, since it uses less digits than its factorization.

261440042051272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273142 (or 3273138 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 40.

The spelling of 261440042051272 in words is "two hundred sixty-one trillion, four hundred forty billion, forty-two million, fifty-one thousand, two hundred seventy-two".