261914936449 has 4 divisors (see below), whose sum is σ = 266354172720. Its totient is φ = 257475700180.

The previous prime is 261914936443. The next prime is 261914936467. The reversal of 261914936449 is 944639419162.

261914936449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261914936449 - 2³ = 261914936441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261914936393 and 261914936402.

It is not an unprimeable number, because it can be changed into a prime (261914936441) 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, 2219618047 + ... + 2219618164.

It is an arithmetic number, because the mean of its divisors is an integer number (66588543180).

Almost surely, 2^261914936449 is an apocalyptic number.

It is an amenable number.

261914936449 is a deficient number, since it is larger than the sum of its proper divisors (4439236271).

261914936449 is an equidigital number, since it uses as much as digits as its factorization.

261914936449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4439236270.

The product of its digits is 10077696, while the sum is 58.

The spelling of 261914936449 in words is "two hundred sixty-one billion, nine hundred fourteen million, nine hundred thirty-six thousand, four hundred forty-nine".