261440706050643 has 128 divisors (see below), whose sum is σ = 415515132887040. Its totient is φ = 143061557184000.

The previous prime is 261440706050633. The next prime is 261440706050663. The reversal of 261440706050643 is 346050607044162.

It is not a de Polignac number, because 261440706050643 - 2⁴ = 261440706050627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261440706050592 and 261440706050601.

It is not an unprimeable number, because it can be changed into a prime (261440706050633) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 63348848446 + ... + 63348852572.

It is an arithmetic number, because the mean of its divisors is an integer number (3246211975680).

Almost surely, 2^{261440706050643} is an apocalyptic number.

261440706050643 is a deficient number, since it is larger than the sum of its proper divisors (154074426836397).

261440706050643 is a wasteful number, since it uses less digits than its factorization.

261440706050643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969.

The product of its (nonzero) digits is 2903040, while the sum is 48.

The spelling of 261440706050643 in words is "two hundred sixty-one trillion, four hundred forty billion, seven hundred six million, fifty thousand, six hundred forty-three".