11640697791 has 4 divisors (see below), whose sum is σ = 15520930392. Its totient is φ = 7760465192.

The previous prime is 11640697777. The next prime is 11640697801. The reversal of 11640697791 is 19779604611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11640697791 - 2⁶ = 11640697727 is a prime.

It is a super-2 number, since 2×11640697791² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11640697291) 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, 1940116296 + ... + 1940116301.

It is an arithmetic number, because the mean of its divisors is an integer number (3880232598).

Almost surely, 2^11640697791 is an apocalyptic number.

11640697791 is a deficient number, since it is larger than the sum of its proper divisors (3880232601).

11640697791 is an equidigital number, since it uses as much as digits as its factorization.

11640697791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3880232600.

The product of its (nonzero) digits is 571536, while the sum is 51.

The spelling of 11640697791 in words is "eleven billion, six hundred forty million, six hundred ninety-seven thousand, seven hundred ninety-one".