1663689264 has 40 divisors (see below), whose sum is σ = 4397819712. Its totient is φ = 541665600.

The previous prime is 1663689263. The next prime is 1663689281. The reversal of 1663689264 is 4629863661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1663689263) 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 7 ways as a sum of consecutive naturals, for example, 400962 + ... + 405089.

Almost surely, 2^1663689264 is an apocalyptic number.

It is an amenable number.

1663689264 is an abundant number, since it is smaller than the sum of its proper divisors (2734130448).

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

1663689264 is a wasteful number, since it uses less digits than its factorization.

1663689264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806105 (or 806099 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 51.

The square root of 1663689264 is about 40788.3471594523. The cubic root of 1663689264 is about 1184.9246604170.

The spelling of 1663689264 in words is "one billion, six hundred sixty-three million, six hundred eighty-nine thousand, two hundred sixty-four".