261646246657213 has 12 divisors (see below), whose sum is σ = 287800206517600. Its totient is φ = 237690202475880.

The previous prime is 261646246657177. The next prime is 261646246657219. The reversal of 261646246657213 is 312756642646162.

It is not a de Polignac number, because 261646246657213 - 2¹⁷ = 261646246526141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646246657219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 772656195 + ... + 772994752.

Almost surely, 2^{261646246657213} is an apocalyptic number.

It is an amenable number.

261646246657213 is a deficient number, since it is larger than the sum of its proper divisors (26153959860387).

261646246657213 is a wasteful number, since it uses less digits than its factorization.

261646246657213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545652368 (or 1545652357 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 61.

The spelling of 261646246657213 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-six million, six hundred fifty-seven thousand, two hundred thirteen".