261646656064252 has 6 divisors (see below), whose sum is σ = 457881648112448. Its totient is φ = 130823328032124.

The previous prime is 261646656064151. The next prime is 261646656064271. The reversal of 261646656064252 is 252460656646162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32705832008028 + ... + 32705832008035.

Almost surely, 2^{261646656064252} is an apocalyptic number.

It is an amenable number.

261646656064252 is a deficient number, since it is larger than the sum of its proper divisors (196234992048196).

261646656064252 is a wasteful number, since it uses less digits than its factorization.

261646656064252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65411664016067 (or 65411664016065 counting only the distinct ones).

The product of its (nonzero) digits is 149299200, while the sum is 61.

The spelling of 261646656064252 in words is "two hundred sixty-one trillion, six hundred forty-six billion, six hundred fifty-six million, sixty-four thousand, two hundred fifty-two".