261052334857 has 4 divisors (see below), whose sum is σ = 262804364100. Its totient is φ = 259300305616.

The previous prime is 261052334843. The next prime is 261052334861. The reversal of 261052334857 is 758433250162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 130983191056 + 130069143801 = 361916^2 + 360651^2 .

It is a cyclic number.

It is not a de Polignac number, because 261052334857 - 2⁷ = 261052334729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261052334867) 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, 876014398 + ... + 876014695.

It is an arithmetic number, because the mean of its divisors is an integer number (65701091025).

Almost surely, 2^261052334857 is an apocalyptic number.

It is an amenable number.

261052334857 is a deficient number, since it is larger than the sum of its proper divisors (1752029243).

261052334857 is a wasteful number, since it uses less digits than its factorization.

261052334857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752029242.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 261052334857 in words is "two hundred sixty-one billion, fifty-two million, three hundred thirty-four thousand, eight hundred fifty-seven".