9840645261 has 8 divisors (see below), whose sum is σ = 14578733760. Its totient is φ = 6560430156.

The previous prime is 9840645187. The next prime is 9840645277. The reversal of 9840645261 is 1625460489.

9840645261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9840645261 - 2¹⁰ = 9840644237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9840645161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182234145 + ... + 182234198.

It is an arithmetic number, because the mean of its divisors is an integer number (1822341720).

Almost surely, 2^9840645261 is an apocalyptic number.

It is an amenable number.

9840645261 is a deficient number, since it is larger than the sum of its proper divisors (4738088499).

9840645261 is a wasteful number, since it uses less digits than its factorization.

9840645261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364468352 (or 364468346 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 9840645261 is about 99200.0265171336. The cubic root of 9840645261 is about 2142.9293784163.

The spelling of 9840645261 in words is "nine billion, eight hundred forty million, six hundred forty-five thousand, two hundred sixty-one".