261656341057674 has 48 divisors (see below), whose sum is σ = 567216789564672. Its totient is φ = 87173441538624.

The previous prime is 261656341057673. The next prime is 261656341057717. The reversal of 261656341057674 is 476750143656162.

261656341057674 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 56 + 3 + 4 + 1 + 0 + 576 + 7 + 4 = 666.

261656341057674 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261656341057673) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1894028647 + ... + 1894166789.

It is an arithmetic number, because the mean of its divisors is an integer number (11817016449264).

Almost surely, 2^{261656341057674} is an apocalyptic number.

261656341057674 is an abundant number, since it is smaller than the sum of its proper divisors (305560448506998).

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

261656341057674 is a wasteful number, since it uses less digits than its factorization.

261656341057674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192091 (or 192088 counting only the distinct ones).

The product of its (nonzero) digits is 152409600, while the sum is 63.

The spelling of 261656341057674 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, three hundred forty-one million, fifty-seven thousand, six hundred seventy-four".