16003640425 has 6 divisors (see below), whose sum is σ = 19844514158. Its totient is φ = 12802912320.

The previous prime is 16003640399. The next prime is 16003640441. The reversal of 16003640425 is 52404630061.

It can be written as a sum of positive squares in 3 ways, for example, as 998370409 + 15005270016 = 31597^2 + 122496^2 .

It is not a de Polignac number, because 16003640425 - 2¹¹ = 16003638377 is a prime.

It is a super-2 number, since 2×16003640425² (a number of 21 digits) contains 22 as substring.

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, 320072784 + ... + 320072833.

Almost surely, 2^16003640425 is an apocalyptic number.

It is an amenable number.

16003640425 is a deficient number, since it is larger than the sum of its proper divisors (3840873733).

16003640425 is an equidigital number, since it uses as much as digits as its factorization.

16003640425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640145627 (or 640145622 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 16003640425 in words is "sixteen billion, three million, six hundred forty thousand, four hundred twenty-five".