261646656343562 has 64 divisors (see below), whose sum is σ = 449439850589184. Its totient is φ = 111908931488640.

The previous prime is 261646656343547. The next prime is 261646656343609. The reversal of 261646656343562 is 265343656646162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76215161798 + ... + 76215165230.

It is an arithmetic number, because the mean of its divisors is an integer number (7022497665456).

Almost surely, 2^{261646656343562} is an apocalyptic number.

261646656343562 is a deficient number, since it is larger than the sum of its proper divisors (187793194245622).

261646656343562 is a wasteful number, since it uses less digits than its factorization.

261646656343562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8763.

The product of its digits is 671846400, while the sum is 65.

The spelling of 261646656343562 in words is "two hundred sixty-one trillion, six hundred forty-six billion, six hundred fifty-six million, three hundred forty-three thousand, five hundred sixty-two".