261136466516213 has 4 divisors (see below), whose sum is σ = 261141689400000. Its totient is φ = 261131243632428.

The previous prime is 261136466516203. The next prime is 261136466516279. The reversal of 261136466516213 is 312615664631162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261136466516213 - 2⁴ = 261136466516197 is a prime.

It is a super-2 number, since 2×261136466516213² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261136466516203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2611366895 + ... + 2611466892.

It is an arithmetic number, because the mean of its divisors is an integer number (65285422350000).

Almost surely, 2^{261136466516213} is an apocalyptic number.

It is an amenable number.

261136466516213 is a deficient number, since it is larger than the sum of its proper divisors (5222883787).

261136466516213 is an equidigital number, since it uses as much as digits as its factorization.

261136466516213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5222883786.

The product of its digits is 5598720, while the sum is 53.

The spelling of 261136466516213 in words is "two hundred sixty-one trillion, one hundred thirty-six billion, four hundred sixty-six million, five hundred sixteen thousand, two hundred thirteen".