16345123009 has 4 divisors (see below), whose sum is σ = 16356610816. Its totient is φ = 16333635204.

The previous prime is 16345122973. The next prime is 16345123043. The reversal of 16345123009 is 90032154361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90032154361 = 349 ⋅257971789.

It is a cyclic number.

It is not a de Polignac number, because 16345123009 - 2⁷ = 16345122881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16345123409) 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, 5741769 + ... + 5744614.

It is an arithmetic number, because the mean of its divisors is an integer number (4089152704).

Almost surely, 2^16345123009 is an apocalyptic number.

It is an amenable number.

16345123009 is a deficient number, since it is larger than the sum of its proper divisors (11487807).

16345123009 is a wasteful number, since it uses less digits than its factorization.

16345123009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11487806.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 16345123009 in words is "sixteen billion, three hundred forty-five million, one hundred twenty-three thousand, nine".