261772275664199 has 2 divisors, whose sum is σ = 261772275664200. Its totient is φ = 261772275664198.

The previous prime is 261772275664153. The next prime is 261772275664219. The reversal of 261772275664199 is 991466572277162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261772275664199 - 2⁴⁰ = 260672764036423 is a prime.

It is a super-2 number, since 2×261772275664199² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261772275664129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130886137832099 + 130886137832100.

It is an arithmetic number, because the mean of its divisors is an integer number (130886137832100).

Almost surely, 2^{261772275664199} is an apocalyptic number.

261772275664199 is a deficient number, since it is larger than the sum of its proper divisors (1).

261772275664199 is an equidigital number, since it uses as much as digits as its factorization.

261772275664199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960180480, while the sum is 74.

The spelling of 261772275664199 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 ninety-nine".