16856031425 has 6 divisors (see below), whose sum is σ = 20901478998. Its totient is φ = 13484825120.

The previous prime is 16856031383. The next prime is 16856031497. The reversal of 16856031425 is 52413065861.

It can be written as a sum of positive squares in 3 ways, for example, as 1631432881 + 15224598544 = 40391^2 + 123388^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16856031425 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 337120604 + ... + 337120653.

It is an arithmetic number, because the mean of its divisors is an integer number (3483579833).

Almost surely, 2^16856031425 is an apocalyptic number.

It is an amenable number.

16856031425 is a deficient number, since it is larger than the sum of its proper divisors (4045447573).

16856031425 is an equidigital number, since it uses as much as digits as its factorization.

16856031425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674241267 (or 674241262 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 16856031425 in words is "sixteen billion, eight hundred fifty-six million, thirty-one thousand, four hundred twenty-five".