261242010345 has 32 divisors (see below), whose sum is σ = 419983459200. Its totient is φ = 138664157184.

The previous prime is 261242010331. The next prime is 261242010347. The reversal of 261242010345 is 543010242162.

It is not a de Polignac number, because 261242010345 - 2¹¹ = 261242008297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261242010347) 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 31 ways as a sum of consecutive naturals, for example, 9222574 + ... + 9250856.

It is an arithmetic number, because the mean of its divisors is an integer number (13124483100).

Almost surely, 2^261242010345 is an apocalyptic number.

It is an amenable number.

261242010345 is a deficient number, since it is larger than the sum of its proper divisors (158741448855).

261242010345 is a wasteful number, since it uses less digits than its factorization.

261242010345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31209.

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 261242010345 in words is "two hundred sixty-one billion, two hundred forty-two million, ten thousand, three hundred forty-five".