16538439707 has 4 divisors (see below), whose sum is σ = 16570932240. Its totient is φ = 16505947176.

The previous prime is 16538439689. The next prime is 16538439713. The reversal of 16538439707 is 70793483561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16538439707 - 2¹² = 16538435611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16538439727) 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, 16245503 + ... + 16246520.

It is an arithmetic number, because the mean of its divisors is an integer number (4142733060).

Almost surely, 2^16538439707 is an apocalyptic number.

16538439707 is a deficient number, since it is larger than the sum of its proper divisors (32492533).

16538439707 is an equidigital number, since it uses as much as digits as its factorization.

16538439707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32492532.

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 16538439707 in words is "sixteen billion, five hundred thirty-eight million, four hundred thirty-nine thousand, seven hundred seven".