11820420667 has 16 divisors (see below), whose sum is σ = 13222028160. Its totient is φ = 10563633960.

The previous prime is 11820420643. The next prime is 11820420697. The reversal of 11820420667 is 76602402811.

It is not a de Polignac number, because 11820420667 - 2¹¹ = 11820418619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11820420697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3268 + ... + 153790.

It is an arithmetic number, because the mean of its divisors is an integer number (826376760).

Almost surely, 2^11820420667 is an apocalyptic number.

11820420667 is a deficient number, since it is larger than the sum of its proper divisors (1401607493).

11820420667 is an equidigital number, since it uses as much as digits as its factorization.

11820420667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150615 (or 150593 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 11820420667 in words is "eleven billion, eight hundred twenty million, four hundred twenty thousand, six hundred sixty-seven".