261543736052076 has 48 divisors (see below), whose sum is σ = 610477815309824. Its totient is φ = 87151376523456.

The previous prime is 261543736052029. The next prime is 261543736052077. The reversal of 261543736052076 is 670250637345162.

It is not an unprimeable number, because it can be changed into a prime (261543736052077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1012519050 + ... + 1012777326.

Almost surely, 2^{261543736052076} is an apocalyptic number.

It is an amenable number.

261543736052076 is an abundant number, since it is smaller than the sum of its proper divisors (348934079257748).

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

261543736052076 is a wasteful number, since it uses less digits than its factorization.

261543736052076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286870 (or 286868 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 57.

The spelling of 261543736052076 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seven hundred thirty-six million, fifty-two thousand, seventy-six".