11661665420 has 12 divisors (see below), whose sum is σ = 24489497424. Its totient is φ = 4664666160.

The previous prime is 11661665417. The next prime is 11661665447. The reversal of 11661665420 is 2456616611.

It is a happy number.

11661665420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291541616 + ... + 291541655.

It is an arithmetic number, because the mean of its divisors is an integer number (2040791452).

Almost surely, 2^11661665420 is an apocalyptic number.

11661665420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661665420 is an abundant number, since it is smaller than the sum of its proper divisors (12827832004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11661665420 is a wasteful number, since it uses less digits than its factorization.

11661665420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583083280 (or 583083278 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 11661665420 in words is "eleven billion, six hundred sixty-one million, six hundred sixty-five thousand, four hundred twenty".