261778470130 has 32 divisors (see below), whose sum is σ = 478972366128. Its totient is φ = 102984806400.

The previous prime is 261778470127. The next prime is 261778470131. The reversal of 261778470130 is 31074877162.

It can be written as a sum of positive squares in 8 ways, for example, as 48926343249 + 212852126881 = 221193^2 + 461359^2 .

It is not an unprimeable number, because it can be changed into a prime (261778470131) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11330190 + ... + 11353270.

Almost surely, 2^261778470130 is an apocalyptic number.

261778470130 is a deficient number, since it is larger than the sum of its proper divisors (217193895998).

261778470130 is a wasteful number, since it uses less digits than its factorization.

261778470130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41742.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 261778470130 in words is "two hundred sixty-one billion, seven hundred seventy-eight million, four hundred seventy thousand, one hundred thirty".