1694993664 has 288 divisors, whose sum is σ = 5640785920. Its totient is φ = 439934976.

The previous prime is 1694993621. The next prime is 1694993681. The reversal of 1694993664 is 4663994961.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5520999 + ... + 5521305.

Almost surely, 2^1694993664 is an apocalyptic number.

1694993664 is a gapful number since it is divisible by the number (14) 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 1694993664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2820392960).

1694993664 is an abundant number, since it is smaller than the sum of its proper divisors (3945792256).

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

1694993664 is a wasteful number, since it uses less digits than its factorization.

1694993664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 411 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 57.

The square root of 1694993664 is about 41170.3007518770. The cubic root of 1694993664 is about 1192.3104757061.

The spelling of 1694993664 in words is "one billion, six hundred ninety-four million, nine hundred ninety-three thousand, six hundred sixty-four".