1601689616 has 20 divisors (see below), whose sum is σ = 3123829824. Its totient is φ = 795540000.

The previous prime is 1601689601. The next prime is 1601689631. The reversal of 1601689616 is 6169861061.

It is an interprime number because it is at equal distance from previous prime (1601689601) and next prime (1601689631).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329060 + ... + 333891.

Almost surely, 2^1601689616 is an apocalyptic number.

1601689616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1601689616 is a deficient number, since it is larger than the sum of its proper divisors (1522140208).

1601689616 is a wasteful number, since it uses less digits than its factorization.

1601689616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663110 (or 663104 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1601689616 is about 40021.1146271565. The cubic root of 1601689616 is about 1170.0186560446.

The spelling of 1601689616 in words is "one billion, six hundred one million, six hundred eighty-nine thousand, six hundred sixteen".