16001617640 has 16 divisors (see below), whose sum is σ = 36003639780. Its totient is φ = 6400647040.

The previous prime is 16001617607. The next prime is 16001617669. The reversal of 16001617640 is 4671610061.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15748744036 + 252873604 = 125494^2 + 15902^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16001617597 and 16001617606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200020181 + ... + 200020260.

Almost surely, 2^16001617640 is an apocalyptic number.

16001617640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16001617640 is an abundant number, since it is smaller than the sum of its proper divisors (20002022140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16001617640 is a wasteful number, since it uses less digits than its factorization.

16001617640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400040452 (or 400040448 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 16001617640 in words is "sixteen billion, one million, six hundred seventeen thousand, six hundred forty".