1663506396 has 30 divisors (see below), whose sum is σ = 4348735160. Its totient is φ = 554502024.

The previous prime is 1663506379. The next prime is 1663506409. The reversal of 1663506396 is 6936053661.

1663506396 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 5 + 0 + 639 + 6 = 666.

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 2566816 + ... + 2567463.

Almost surely, 2^1663506396 is an apocalyptic number.

It is an amenable number.

1663506396 is an abundant number, since it is smaller than the sum of its proper divisors (2685228764).

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

1663506396 is a wasteful number, since it uses less digits than its factorization.

1663506396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5134295 (or 5134284 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 45.

The square root of 1663506396 is about 40786.1054281970. The cubic root of 1663506396 is about 1184.8812443081.

The spelling of 1663506396 in words is "one billion, six hundred sixty-three million, five hundred six thousand, three hundred ninety-six".