16216420509 has 32 divisors (see below), whose sum is σ = 25169530880. Its totient is φ = 10306018800.

The previous prime is 16216420489. The next prime is 16216420511. The reversal of 16216420509 is 90502461261.

16216420509 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 642 + 0 + 5 + 0 + 9 = 666.

It is not a de Polignac number, because 16216420509 - 2²⁴ = 16199643293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16216420559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88507 + ... + 200664.

It is an arithmetic number, because the mean of its divisors is an integer number (786547840).

Almost surely, 2^16216420509 is an apocalyptic number.

It is an amenable number.

16216420509 is a deficient number, since it is larger than the sum of its proper divisors (8953110371).

16216420509 is a wasteful number, since it uses less digits than its factorization.

16216420509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289278 (or 289272 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 16216420509 in words is "sixteen billion, two hundred sixteen million, four hundred twenty thousand, five hundred nine".