261450371651330 has 8 divisors (see below), whose sum is σ = 470610668972412. Its totient is φ = 104580148660528.

The previous prime is 261450371651327. The next prime is 261450371651377. The reversal of 261450371651330 is 33156173054162.

It can be written as a sum of positive squares in 2 ways, for example, as 253009202625169 + 8441169026161 = 15906263^2 + 2905369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×261450371651330² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13072518582557 + ... + 13072518582576.

Almost surely, 2^{261450371651330} is an apocalyptic number.

261450371651330 is a deficient number, since it is larger than the sum of its proper divisors (209160297321082).

261450371651330 is a wasteful number, since it uses less digits than its factorization.

261450371651330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26145037165140.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 261450371651330 in words is "two hundred sixty-one trillion, four hundred fifty billion, three hundred seventy-one million, six hundred fifty-one thousand, three hundred thirty".