16606660421 has 16 divisors (see below), whose sum is σ = 18836932800. Its totient is φ = 14513499648.

The previous prime is 16606660391. The next prime is 16606660519. The reversal of 16606660421 is 12406660661.

It is a cyclic number.

It is not a de Polignac number, because 16606660421 - 2²² = 16602466117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16606666421) 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, 399350 + ... + 438968.

It is an arithmetic number, because the mean of its divisors is an integer number (1177308300).

Almost surely, 2^16606660421 is an apocalyptic number.

It is an amenable number.

16606660421 is a deficient number, since it is larger than the sum of its proper divisors (2230272379).

16606660421 is a wasteful number, since it uses less digits than its factorization.

16606660421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41348.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 16606660421 in words is "sixteen billion, six hundred six million, six hundred sixty thousand, four hundred twenty-one".