261646243632334 has 12 divisors (see below), whose sum is σ = 431391947146272. Its totient is φ = 118930110741860.

The previous prime is 261646243632329. The next prime is 261646243632343. The reversal of 261646243632334 is 433236342646162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 540591412222 + ... + 540591412705.

It is an arithmetic number, because the mean of its divisors is an integer number (35949328928856).

Almost surely, 2^{261646243632334} is an apocalyptic number.

261646243632334 is a deficient number, since it is larger than the sum of its proper divisors (169745703513938).

261646243632334 is a wasteful number, since it uses less digits than its factorization.

261646243632334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081182824951 (or 1081182824940 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 55.

The spelling of 261646243632334 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-three million, six hundred thirty-two thousand, three hundred thirty-four".