261646737541170 has 64 divisors (see below), whose sum is σ = 631130429389824. Its totient is φ = 69419682881280.

The previous prime is 261646737541169. The next prime is 261646737541171. The reversal of 261646737541170 is 71145737646162.

261646737541170 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261646737541169) and next prime (261646737541171).

It is not an unprimeable number, because it can be changed into a prime (261646737541171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 415204 + ... + 22879376.

It is an arithmetic number, because the mean of its divisors is an integer number (9861412959216).

Almost surely, 2^{261646737541170} is an apocalyptic number.

261646737541170 is an abundant number, since it is smaller than the sum of its proper divisors (369483691848654).

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

261646737541170 is a wasteful number, since it uses less digits than its factorization.

261646737541170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22466147.

The product of its (nonzero) digits is 35562240, while the sum is 60.

The spelling of 261646737541170 in words is "two hundred sixty-one trillion, six hundred forty-six billion, seven hundred thirty-seven million, five hundred forty-one thousand, one hundred seventy".