261772275664159 has 6 divisors (see below), whose sum is σ = 283457552938296. Its totient is φ = 241635946766760.

The previous prime is 261772275664153. The next prime is 261772275664199. The reversal of 261772275664159 is 951466572277162.

It is not a de Polignac number, because 261772275664159 - 2⁴¹ = 259573252408607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261772275664153) 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 5 ways as a sum of consecutive naturals, for example, 774474188187 + ... + 774474188524.

It is an arithmetic number, because the mean of its divisors is an integer number (47242925489716).

Almost surely, 2^{261772275664159} is an apocalyptic number.

261772275664159 is a deficient number, since it is larger than the sum of its proper divisors (21685277274137).

261772275664159 is a wasteful number, since it uses less digits than its factorization.

261772275664159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548948376737 (or 1548948376724 counting only the distinct ones).

The product of its digits is 533433600, while the sum is 70.

The spelling of 261772275664159 in words is "two hundred sixty-one trillion, seven hundred seventy-two billion, two hundred seventy-five million, six hundred sixty-four thousand, one hundred fifty-nine".