261673636434344 has 8 divisors (see below), whose sum is σ = 490638068314410. Its totient is φ = 130836818217168.

The previous prime is 261673636434299. The next prime is 261673636434347. The reversal of 261673636434344 is 443434636376162.

It can be written as a sum of positive squares in only one way, i.e., 142860104808100 + 118813531626244 = 11952410^2 + 10900162^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (261673636434347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16354602277139 + ... + 16354602277154.

Almost surely, 2^{261673636434344} is an apocalyptic number.

It is an amenable number.

261673636434344 is a deficient number, since it is larger than the sum of its proper divisors (228964431880066).

261673636434344 is a wasteful number, since it uses less digits than its factorization.

261673636434344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32709204554299 (or 32709204554295 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 62.

The spelling of 261673636434344 in words is "two hundred sixty-one trillion, six hundred seventy-three billion, six hundred thirty-six million, four hundred thirty-four thousand, three hundred forty-four".