261447084207618 has 96 divisors (see below), whose sum is σ = 549050410117440. Its totient is φ = 82989393231360.

The previous prime is 261447084207611. The next prime is 261447084207623. The reversal of 261447084207618 is 816702480744162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261447084207611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1006818505 + ... + 1007078147.

It is an arithmetic number, because the mean of its divisors is an integer number (5719275105390).

Almost surely, 2^{261447084207618} is an apocalyptic number.

261447084207618 is an abundant number, since it is smaller than the sum of its proper divisors (287603325909822).

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

261447084207618 is a wasteful number, since it uses less digits than its factorization.

261447084207618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261104 (or 261081 counting only the distinct ones).

The product of its (nonzero) digits is 28901376, while the sum is 60.

The spelling of 261447084207618 in words is "two hundred sixty-one trillion, four hundred forty-seven billion, eighty-four million, two hundred seven thousand, six hundred eighteen".