261646061312217 has 16 divisors (see below), whose sum is σ = 348911226872000. Its totient is φ = 174405802655232.

The previous prime is 261646061312143. The next prime is 261646061312227. The reversal of 261646061312217 is 712213160646162.

It is a de Polignac number, because none of the positive numbers 2^k-261646061312217 is a prime.

It is a super-2 number, since 2×261646061312217² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261646061312227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1388368398 + ... + 1388556840.

It is an arithmetic number, because the mean of its divisors is an integer number (21806951679500).

Almost surely, 2^{261646061312217} is an apocalyptic number.

It is an amenable number.

261646061312217 is a deficient number, since it is larger than the sum of its proper divisors (87265165559783).

261646061312217 is a wasteful number, since it uses less digits than its factorization.

261646061312217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252072.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 261646061312217 in words is "two hundred sixty-one trillion, six hundred forty-six billion, sixty-one million, three hundred twelve thousand, two hundred seventeen".