16516078385 has 8 divisors (see below), whose sum is σ = 19845479976. Its totient is φ = 13195405440.

The previous prime is 16516078379. The next prime is 16516078387. The reversal of 16516078385 is 58387061561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 133102369 + 16382976016 = 11537^2 + 127996^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16516078385 - 2⁸ = 16516078129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16516078387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2177996 + ... + 2185565.

It is an arithmetic number, because the mean of its divisors is an integer number (2480684997).

Almost surely, 2^16516078385 is an apocalyptic number.

It is an amenable number.

16516078385 is a deficient number, since it is larger than the sum of its proper divisors (3329401591).

16516078385 is an equidigital number, since it uses as much as digits as its factorization.

16516078385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364323.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 16516078385 in words is "sixteen billion, five hundred sixteen million, seventy-eight thousand, three hundred eighty-five".