261440042354532 has 72 divisors (see below), whose sum is σ = 692362267181312. Its totient is φ = 83076758740800.

The previous prime is 261440042354507. The next prime is 261440042354573. The reversal of 261440042354532 is 235453240044162.

261440042354532 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 40 + 0 + 4 + 23 + 54 + 532 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1748173519 + ... + 1748323062.

Almost surely, 2^{261440042354532} is an apocalyptic number.

It is an amenable number.

261440042354532 is an abundant number, since it is smaller than the sum of its proper divisors (430922224826780).

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

261440042354532 is a wasteful number, since it uses less digits than its factorization.

261440042354532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496496689 (or 3496496684 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 45.

Adding to 261440042354532 its reverse (235453240044162), we get a palindrome (496893282398694).

The spelling of 261440042354532 in words is "two hundred sixty-one trillion, four hundred forty billion, forty-two million, three hundred fifty-four thousand, five hundred thirty-two".