261543700315010 has 16 divisors (see below), whose sum is σ = 472263766757496. Its totient is φ = 104287456528128.

The previous prime is 261543700314991. The next prime is 261543700315043. The reversal of 261543700315010 is 10513007345162.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 108983431677169 + 152560268637841 = 10439513^2 + 12351529^2 .

It is an unprimeable number.

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, 41252946407 + ... + 41252952746.

Almost surely, 2^{261543700315010} is an apocalyptic number.

261543700315010 is a deficient number, since it is larger than the sum of its proper divisors (210720066442486).

261543700315010 is a wasteful number, since it uses less digits than its factorization.

261543700315010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82505899477.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 261543700315010 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seven hundred million, three hundred fifteen thousand, ten".