16666121442 has 8 divisors (see below), whose sum is σ = 33332242896. Its totient is φ = 5555373812.

The previous prime is 16666121419. The next prime is 16666121443. The reversal of 16666121442 is 24412166661.

It is a sphenic number, since it is the product of 3 distinct primes.

16666121442 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 16666121442.

It is not an unprimeable number, because it can be changed into a prime (16666121443) 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, 1388843448 + ... + 1388843459.

It is an arithmetic number, because the mean of its divisors is an integer number (4166530362).

Almost surely, 2^16666121442 is an apocalyptic number.

16666121442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16666121442 is a wasteful number, since it uses less digits than its factorization.

16666121442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777686912.

The product of its digits is 82944, while the sum is 39.

The spelling of 16666121442 in words is "sixteen billion, six hundred sixty-six million, one hundred twenty-one thousand, four hundred forty-two".