11781005271 has 96 divisors (see below), whose sum is σ = 19699200000. Its totient is φ = 6225605568.

The previous prime is 11781005263. The next prime is 11781005273. The reversal of 11781005271 is 17250018711.

It is not a de Polignac number, because 11781005271 - 2³ = 11781005263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781005273) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23608980 + ... + 23609478.

It is an arithmetic number, because the mean of its divisors is an integer number (205200000).

Almost surely, 2^11781005271 is an apocalyptic number.

11781005271 is a deficient number, since it is larger than the sum of its proper divisors (7918194729).

11781005271 is a wasteful number, since it uses less digits than its factorization.

11781005271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 33.

The spelling of 11781005271 in words is "eleven billion, seven hundred eighty-one million, five thousand, two hundred seventy-one".