261200243660 has 48 divisors (see below), whose sum is σ = 550803407616. Its totient is φ = 104045548992.

The previous prime is 261200243573. The next prime is 261200243663. The reversal of 261200243660 is 66342002162.

261200243660 is digitally balanced in base 3, because in such base 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 (261200243663) 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 15 ways as a sum of consecutive naturals, for example, 18229259 + ... + 18243581.

It is an arithmetic number, because the mean of its divisors is an integer number (11475070992).

Almost surely, 2^261200243660 is an apocalyptic number.

261200243660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261200243660 is an abundant number, since it is smaller than the sum of its proper divisors (289603163956).

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

261200243660 is a wasteful number, since it uses less digits than its factorization.

261200243660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18062 (or 18060 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 261200243660 in words is "two hundred sixty-one billion, two hundred million, two hundred forty-three thousand, six hundred sixty".