261876572813 has 4 divisors (see below), whose sum is σ = 261903807360. Its totient is φ = 261849338268.

The previous prime is 261876572791. The next prime is 261876572857. The reversal of 261876572813 is 318275678162.

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 a de Polignac number, because none of the positive numbers 2^k-261876572813 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 (261876572863) 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, 13602845 + ... + 13622082.

It is an arithmetic number, because the mean of its divisors is an integer number (65475951840).

Almost surely, 2^261876572813 is an apocalyptic number.

It is an amenable number.

261876572813 is a deficient number, since it is larger than the sum of its proper divisors (27234547).

261876572813 is an equidigital number, since it uses as much as digits as its factorization.

261876572813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27234546.

The product of its digits is 6773760, while the sum is 56.

The spelling of 261876572813 in words is "two hundred sixty-one billion, eight hundred seventy-six million, five hundred seventy-two thousand, eight hundred thirteen".