261146472224609 has 4 divisors (see below), whose sum is σ = 261148913112516. Its totient is φ = 261144031336704.

The previous prime is 261146472224567. The next prime is 261146472224639. The reversal of 261146472224609 is 906422274641162.

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 245048498700625 + 16097973523984 = 15654025^2 + 4012228^2 .

It is a cyclic number.

It is not a de Polignac number, because 261146472224609 - 2²⁸ = 261146203789153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261146472224639) 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, 1220283464 + ... + 1220497449.

It is an arithmetic number, because the mean of its divisors is an integer number (65287228278129).

Almost surely, 2^{261146472224609} is an apocalyptic number.

It is an amenable number.

261146472224609 is a deficient number, since it is larger than the sum of its proper divisors (2440887907).

261146472224609 is a wasteful number, since it uses less digits than its factorization.

261146472224609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440887906.

The product of its (nonzero) digits is 13934592, while the sum is 56.

The spelling of 261146472224609 in words is "two hundred sixty-one trillion, one hundred forty-six billion, four hundred seventy-two million, two hundred twenty-four thousand, six hundred nine".