261266194945 has 8 divisors (see below), whose sum is σ = 358307924544. Its totient is φ = 179153962224.

The previous prime is 261266194913. The next prime is 261266194967. The reversal of 261266194945 is 549491662162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261266194945 - 2⁵ = 261266194913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3732374179 + ... + 3732374248.

It is an arithmetic number, because the mean of its divisors is an integer number (44788490568).

Almost surely, 2^261266194945 is an apocalyptic number.

It is an amenable number.

261266194945 is a deficient number, since it is larger than the sum of its proper divisors (97041729599).

261266194945 is an equidigital number, since it uses as much as digits as its factorization.

261266194945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7464748439.

The product of its digits is 5598720, while the sum is 55.

The spelling of 261266194945 in words is "two hundred sixty-one billion, two hundred sixty-six million, one hundred ninety-four thousand, nine hundred forty-five".