261331140952 has 32 divisors (see below), whose sum is σ = 592936204320. Its totient is φ = 105410880000.

The previous prime is 261331140841. The next prime is 261331140953. The reversal of 261331140952 is 259041133162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261331140953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137252799 + ... + 137254702.

It is an arithmetic number, because the mean of its divisors is an integer number (18529256385).

Almost surely, 2^261331140952 is an apocalyptic number.

It is an amenable number.

261331140952 is an abundant number, since it is smaller than the sum of its proper divisors (331605063368).

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

261331140952 is a wasteful number, since it uses less digits than its factorization.

261331140952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274507531 (or 274507527 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 261331140952 in words is "two hundred sixty-one billion, three hundred thirty-one million, one hundred forty thousand, nine hundred fifty-two".