1663646607 has 40 divisors (see below), whose sum is σ = 2843596800. Its totient is φ = 949528656.

The previous prime is 1663646549. The next prime is 1663646609. The reversal of 1663646607 is 7066463661.

1663646607 is a `hidden beast` number, since 1 + 6 + 6 + 36 + 4 + 6 + 607 = 666.

It is not a de Polignac number, because 1663646607 - 2¹² = 1663642511 is a prime.

It is a super-2 number, since 2×1663646607² = 5535440065965224898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663646609) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 814894 + ... + 816932.

It is an arithmetic number, because the mean of its divisors is an integer number (71089920).

Almost surely, 2^1663646607 is an apocalyptic number.

1663646607 is a deficient number, since it is larger than the sum of its proper divisors (1179950193).

1663646607 is a wasteful number, since it uses less digits than its factorization.

1663646607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497 (or 3488 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The square root of 1663646607 is about 40787.8242494007. The cubic root of 1663646607 is about 1184.9145331726.

The spelling of 1663646607 in words is "one billion, six hundred sixty-three million, six hundred forty-six thousand, six hundred seven".