11727071661 has 16 divisors (see below), whose sum is σ = 16090702848. Its totient is φ = 7593284400.

The previous prime is 11727071647. The next prime is 11727071677. The reversal of 11727071661 is 16617072711.

It is not a de Polignac number, because 11727071661 - 2¹⁵ = 11727038893 is a prime.

It is a super-3 number, since 3×11727071661³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11727071611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298975 + ... + 335916.

It is an arithmetic number, because the mean of its divisors is an integer number (1005668928).

Almost surely, 2^11727071661 is an apocalyptic number.

It is an amenable number.

11727071661 is a deficient number, since it is larger than the sum of its proper divisors (4363631187).

11727071661 is a wasteful number, since it uses less digits than its factorization.

11727071661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635072.

The product of its (nonzero) digits is 24696, while the sum is 39.

The spelling of 11727071661 in words is "eleven billion, seven hundred twenty-seven million, seventy-one thousand, six hundred sixty-one".