261431274476446 has 16 divisors (see below), whose sum is σ = 401725530314640. Its totient is φ = 127522987542720.

The previous prime is 261431274476443. The next prime is 261431274476467. The reversal of 261431274476446 is 644674472134162.

It is a super-2 number, since 2×261431274476446² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261431274476443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53435001 + ... + 58121956.

It is an arithmetic number, because the mean of its divisors is an integer number (25107845644665).

Almost surely, 2^{261431274476446} is an apocalyptic number.

261431274476446 is a deficient number, since it is larger than the sum of its proper divisors (140294255838194).

261431274476446 is a wasteful number, since it uses less digits than its factorization.

261431274476446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111585579.

The product of its digits is 130056192, while the sum is 61.

The spelling of 261431274476446 in words is "two hundred sixty-one trillion, four hundred thirty-one billion, two hundred seventy-four million, four hundred seventy-six thousand, four hundred forty-six".