11668720667 has 4 divisors (see below), whose sum is σ = 12282863880. Its totient is φ = 11054577456.

The previous prime is 11668720649. The next prime is 11668720681. The reversal of 11668720667 is 76602786611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76602786611 = 13 ⋅5892522047.

It is a cyclic number.

It is not a de Polignac number, because 11668720667 - 2⁸ = 11668720411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11668720607) 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, 307071578 + ... + 307071615.

It is an arithmetic number, because the mean of its divisors is an integer number (3070715970).

Almost surely, 2^11668720667 is an apocalyptic number.

11668720667 is a deficient number, since it is larger than the sum of its proper divisors (614143213).

11668720667 is an equidigital number, since it uses as much as digits as its factorization.

11668720667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614143212.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 11668720667 in words is "eleven billion, six hundred sixty-eight million, seven hundred twenty thousand, six hundred sixty-seven".