261656231015013 has 16 divisors (see below), whose sum is σ = 350012882493120. Its totient is φ = 173868538334976.

The previous prime is 261656231014993. The next prime is 261656231015087. The reversal of 261656231015013 is 310510132656162.

It is a happy number.

It is not a de Polignac number, because 261656231015013 - 2¹⁸ = 261656230752869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261656231015813) 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, 286499131 + ... + 287410967.

It is an arithmetic number, because the mean of its divisors is an integer number (21875805155820).

Almost surely, 2^{261656231015013} is an apocalyptic number.

It is an amenable number.

261656231015013 is a deficient number, since it is larger than the sum of its proper divisors (88356651478107).

261656231015013 is a wasteful number, since it uses less digits than its factorization.

261656231015013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223716.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 261656231015013 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, two hundred thirty-one million, fifteen thousand, thirteen".