261018633804 has 12 divisors (see below), whose sum is σ = 609043478904. Its totient is φ = 87006211264.

The previous prime is 261018633803. The next prime is 261018633851. The reversal of 261018633804 is 408336810162.

261018633804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (261018633803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10875776397 + ... + 10875776420.

It is an arithmetic number, because the mean of its divisors is an integer number (50753623242).

Almost surely, 2^261018633804 is an apocalyptic number.

It is an amenable number.

261018633804 is an abundant number, since it is smaller than the sum of its proper divisors (348024845100).

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

261018633804 is a wasteful number, since it uses less digits than its factorization.

261018633804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21751552824 (or 21751552822 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 261018633804 in words is "two hundred sixty-one billion, eighteen million, six hundred thirty-three thousand, eight hundred four".