261591120613 has 16 divisors (see below), whose sum is σ = 271428796800. Its totient is φ = 251947350720.

The previous prime is 261591120589. The next prime is 261591120653. The reversal of 261591120613 is 316021195162.

It is not a de Polignac number, because 261591120613 - 2³⁷ = 124152167141 is a prime.

It is a super-2 number, since 2×261591120613² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261591120653) 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, 2158048 + ... + 2276038.

It is an arithmetic number, because the mean of its divisors is an integer number (16964299800).

Almost surely, 2^261591120613 is an apocalyptic number.

It is an amenable number.

261591120613 is a deficient number, since it is larger than the sum of its proper divisors (9837676187).

261591120613 is a wasteful number, since it uses less digits than its factorization.

261591120613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118812.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 261591120613 in words is "two hundred sixty-one billion, five hundred ninety-one million, one hundred twenty thousand, six hundred thirteen".