1663688072 has 24 divisors (see below), whose sum is σ = 3260946990. Its totient is φ = 795674880.

The previous prime is 1663688071. The next prime is 1663688087. The reversal of 1663688072 is 2708863661.

It can be written as a sum of positive squares in only one way, i.e., 1496606596 + 167081476 = 38686^2 + 12926^2 .

It is a super-3 number, since 3×1663688072³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1663688071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192329 + ... + 200792.

Almost surely, 2^1663688072 is an apocalyptic number.

It is an amenable number.

1663688072 is a deficient number, since it is larger than the sum of its proper divisors (1597258918).

1663688072 is a wasteful number, since it uses less digits than its factorization.

1663688072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393173 (or 393146 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 1663688072 is about 40788.3325474332. The cubic root of 1663688072 is about 1184.9243774253.

The spelling of 1663688072 in words is "one billion, six hundred sixty-three million, six hundred eighty-eight thousand, seventy-two".