261440042355056 has 10 divisors (see below), whose sum is σ = 506540082062952. Its totient is φ = 130720021177520.

The previous prime is 261440042354999. The next prime is 261440042355083. The reversal of 261440042355056 is 650553240044162.

261440042355056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261440042355056² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261440042355056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8170001323580 + ... + 8170001323611.

Almost surely, 2^{261440042355056} is an apocalyptic number.

It is an amenable number.

261440042355056 is a deficient number, since it is larger than the sum of its proper divisors (245100039707896).

261440042355056 is a wasteful number, since it uses less digits than its factorization.

261440042355056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16340002647199 (or 16340002647193 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 47.

The spelling of 261440042355056 in words is "two hundred sixty-one trillion, four hundred forty billion, forty-two million, three hundred fifty-five thousand, fifty-six".