11506665601 has 4 divisors (see below), whose sum is σ = 12112279600. Its totient is φ = 10901051604.

The previous prime is 11506665523. The next prime is 11506665637. The reversal of 11506665601 is 10656660511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11506665601 - 2⁹ = 11506665089 is a prime.

It is a super-3 number, since 3×11506665601³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (11506665701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302806971 + ... + 302807008.

It is an arithmetic number, because the mean of its divisors is an integer number (3028069900).

Almost surely, 2^11506665601 is an apocalyptic number.

It is an amenable number.

11506665601 is a deficient number, since it is larger than the sum of its proper divisors (605613999).

11506665601 is an equidigital number, since it uses as much as digits as its factorization.

11506665601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605613998.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 11506665601 in words is "eleven billion, five hundred six million, six hundred sixty-five thousand, six hundred one".