1617681616 has 10 divisors (see below), whose sum is σ = 3134258162. Its totient is φ = 808840800.

The previous prime is 1617681511. The next prime is 1617681623. The reversal of 1617681616 is 6161867161.

It can be written as a sum of positive squares in only one way, i.e., 1398760000 + 218921616 = 37400^2 + 14796^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50552535 + ... + 50552566.

Almost surely, 2^1617681616 is an apocalyptic number.

1617681616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1617681616 is a deficient number, since it is larger than the sum of its proper divisors (1516576546).

1617681616 is a wasteful number, since it uses less digits than its factorization.

1617681616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101105109 (or 101105103 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 1617681616 is about 40220.4129267714. The cubic root of 1617681616 is about 1173.8997676849.

The spelling of 1617681616 in words is "one billion, six hundred seventeen million, six hundred eighty-one thousand, six hundred sixteen".