11806723561 has 8 divisors (see below), whose sum is σ = 12391277760. Its totient is φ = 11228104272.

The previous prime is 11806723549. The next prime is 11806723589. The reversal of 11806723561 is 16532760811.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11806723561 - 2⁷ = 11806723433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11806723361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1479651 + ... + 1487608.

It is an arithmetic number, because the mean of its divisors is an integer number (1548909720).

Almost surely, 2^11806723561 is an apocalyptic number.

It is an amenable number.

11806723561 is a deficient number, since it is larger than the sum of its proper divisors (584554199).

11806723561 is a wasteful number, since it uses less digits than its factorization.

11806723561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967455.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 11806723561 in words is "eleven billion, eight hundred six million, seven hundred twenty-three thousand, five hundred sixty-one".