261756552443 has 4 divisors (see below), whose sum is σ = 261775380168. Its totient is φ = 261737724720.

The previous prime is 261756552439. The next prime is 261756552457. The reversal of 261756552443 is 344255657162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261756552443 - 2² = 261756552439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261756552391 and 261756552400.

It is not an unprimeable number, because it can be changed into a prime (261756551443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9392993 + ... + 9420818.

It is an arithmetic number, because the mean of its divisors is an integer number (65443845042).

Almost surely, 2^261756552443 is an apocalyptic number.

261756552443 is a deficient number, since it is larger than the sum of its proper divisors (18827725).

261756552443 is a wasteful number, since it uses less digits than its factorization.

261756552443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18827724.

The product of its digits is 6048000, while the sum is 50.

The spelling of 261756552443 in words is "two hundred sixty-one billion, seven hundred fifty-six million, five hundred fifty-two thousand, four hundred forty-three".