16405639416 has 48 divisors (see below), whose sum is σ = 45964081800. Its totient is φ = 5279975232.

The previous prime is 16405639381. The next prime is 16405639417. The reversal of 16405639416 is 61493650461.

16405639416 is a `hidden beast` number, since 1 + 6 + 4 + 0 + 5 + 639 + 4 + 1 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16405639417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3926466 + ... + 3930641.

Almost surely, 2^16405639416 is an apocalyptic number.

It is an amenable number.

16405639416 is an abundant number, since it is smaller than the sum of its proper divisors (29558442384).

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

16405639416 is a wasteful number, since it uses less digits than its factorization.

16405639416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7857148 (or 7857141 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 16405639416 in words is "sixteen billion, four hundred five million, six hundred thirty-nine thousand, four hundred sixteen".