11743840161 has 15 divisors (see below), whose sum is σ = 17544724483. Its totient is φ = 7828576560.

The previous prime is 11743840153. The next prime is 11743840183. The reversal of 11743840161 is 16104834711.

The square root of 11743840161 is 108369.

It is a perfect power (a square), and thus also a powerful number.

11743840161 is a `hidden beast` number, since 117 + 4 + 384 + 0 + 161 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7450969761 + 4292870400 = 86319^2 + 65520^2 .

It is not a de Polignac number, because 11743840161 - 2³ = 11743840153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11743840111) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 969301 + ... + 981341.

Almost surely, 2^11743840161 is an apocalyptic number.

11743840161 is the 108369-th square number.

11743840161 is the 54185-th centered octagonal number.

It is an amenable number.

11743840161 is a deficient number, since it is larger than the sum of its proper divisors (5800884322).

11743840161 is an frugal number, since it uses more digits than its factorization.

11743840161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24094 (or 12044 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

Multiplying 11743840161 by its sum of digits (36), we get a square (422778245796 = 650214²).

The spelling of 11743840161 in words is "eleven billion, seven hundred forty-three million, eight hundred forty thousand, one hundred sixty-one".