1601994816 has 84 divisors (see below), whose sum is σ = 4602512512. Its totient is φ = 532756224.

The previous prime is 1601994803. The next prime is 1601994817. The reversal of 1601994816 is 6184991061.

1601994816 is a `hidden beast` number, since 160 + 1 + 9 + 9 + 481 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601994817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 263685 + ... + 269691.

Almost surely, 2^1601994816 is an apocalyptic number.

1601994816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1601994816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2301256256).

1601994816 is an abundant number, since it is smaller than the sum of its proper divisors (3000517696).

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

1601994816 is a wasteful number, since it uses less digits than its factorization.

1601994816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488 (or 6475 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1601994816 is about 40024.9274327887. The cubic root of 1601994816 is about 1170.0929665335.

The spelling of 1601994816 in words is "one billion, six hundred one million, nine hundred ninety-four thousand, eight hundred sixteen".