261656341061660 has 48 divisors (see below), whose sum is σ = 549985562733600. Its totient is φ = 104565932949504.

The previous prime is 261656341061657. The next prime is 261656341061681. The reversal of 261656341061660 is 66160143656162.

261656341061660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284405276 + ... + 285323804.

It is an arithmetic number, because the mean of its divisors is an integer number (11458032556950).

Almost surely, 2^{261656341061660} is an apocalyptic number.

261656341061660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261656341061660 is an abundant number, since it is smaller than the sum of its proper divisors (288329221671940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261656341061660 is a wasteful number, since it uses less digits than its factorization.

261656341061660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931670 (or 931668 counting only the distinct ones).

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

The spelling of 261656341061660 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, three hundred forty-one million, sixty-one thousand, six hundred sixty".