261313249613 has 16 divisors (see below), whose sum is σ = 303450571200. Its totient is φ = 222943259520.

The previous prime is 261313249607. The next prime is 261313249649. The reversal of 261313249613 is 316942313162.

It is a cyclic number.

It is not a de Polignac number, because 261313249613 - 2¹⁸ = 261312987469 is a prime.

It is a super-2 number, since 2×261313249613² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261313249913) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12891683 + ... + 12911936.

It is an arithmetic number, because the mean of its divisors is an integer number (18965660700).

Almost surely, 2^261313249613 is an apocalyptic number.

It is an amenable number.

261313249613 is a deficient number, since it is larger than the sum of its proper divisors (42137321587).

261313249613 is a wasteful number, since it uses less digits than its factorization.

261313249613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25803692.

The product of its digits is 139968, while the sum is 41.

The spelling of 261313249613 in words is "two hundred sixty-one billion, three hundred thirteen million, two hundred forty-nine thousand, six hundred thirteen".