16235440015 has 4 divisors (see below), whose sum is σ = 19482528024. Its totient is φ = 12988352008.

The previous prime is 16235440009. The next prime is 16235440027. The reversal of 16235440015 is 51004453261.

It is a happy number.

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 16235440015 - 2³ = 16235440007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623543997 + ... + 1623544006.

It is an arithmetic number, because the mean of its divisors is an integer number (4870632006).

Almost surely, 2^16235440015 is an apocalyptic number.

16235440015 is a deficient number, since it is larger than the sum of its proper divisors (3247088009).

16235440015 is an equidigital number, since it uses as much as digits as its factorization.

16235440015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247088008.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 16235440015 its reverse (51004453261), we get a palindrome (67239893276).

The spelling of 16235440015 in words is "sixteen billion, two hundred thirty-five million, four hundred forty thousand, fifteen".