261273724015211 has 4 divisors (see below), whose sum is σ = 261383456787024. Its totient is φ = 261163991243400.

The previous prime is 261273724014997. The next prime is 261273724015301. The reversal of 261273724015211 is 112510427372162.

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 261273724015211 - 2⁴² = 256875677504107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261273724095211) 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, 54866382335 + ... + 54866387096.

It is an arithmetic number, because the mean of its divisors is an integer number (65345864196756).

Almost surely, 2^{261273724015211} is an apocalyptic number.

261273724015211 is a deficient number, since it is larger than the sum of its proper divisors (109732771813).

261273724015211 is a wasteful number, since it uses less digits than its factorization.

261273724015211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109732771812.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 261273724015211 in words is "two hundred sixty-one trillion, two hundred seventy-three billion, seven hundred twenty-four million, fifteen thousand, two hundred eleven".