16428557815 has 4 divisors (see below), whose sum is σ = 19714269384. Its totient is φ = 13142846248.

The previous prime is 16428557791. The next prime is 16428557819. The reversal of 16428557815 is 51875582461.

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 16428557815 - 2⁹ = 16428557303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16428557819) 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, 1642855777 + ... + 1642855786.

It is an arithmetic number, because the mean of its divisors is an integer number (4928567346).

Almost surely, 2^16428557815 is an apocalyptic number.

16428557815 is a deficient number, since it is larger than the sum of its proper divisors (3285711569).

16428557815 is an equidigital number, since it uses as much as digits as its factorization.

16428557815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285711568.

The product of its digits is 2688000, while the sum is 52.

The spelling of 16428557815 in words is "sixteen billion, four hundred twenty-eight million, five hundred fifty-seven thousand, eight hundred fifteen".