261553310527106 has 32 divisors (see below), whose sum is σ = 423571053145968. Its totient is φ = 120413535897600.

The previous prime is 261553310527099. The next prime is 261553310527141. The reversal of 261553310527106 is 601725013355162.

It can be written as a sum of positive squares in 8 ways, for example, as 250248955309081 + 11304355218025 = 15819259^2 + 3362195^2 .

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 15 ways as a sum of consecutive naturals, for example, 610467950 + ... + 610896246.

Almost surely, 2^{261553310527106} is an apocalyptic number.

261553310527106 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

261553310527106 is a deficient number, since it is larger than the sum of its proper divisors (162017742618862).

261553310527106 is a wasteful number, since it uses less digits than its factorization.

261553310527106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487286.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 261553310527106 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, three hundred ten million, five hundred twenty-seven thousand, one hundred six".