1630720663 has 32 divisors (see below), whose sum is σ = 1994207040. Its totient is φ = 1313034240.

The previous prime is 1630720643. The next prime is 1630720673. The reversal of 1630720663 is 3660270361.

It is a cyclic number.

It is not a de Polignac number, because 1630720663 - 2¹⁷ = 1630589591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630720643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 716295 + ... + 718567.

It is an arithmetic number, because the mean of its divisors is an integer number (62318970).

Almost surely, 2^1630720663 is an apocalyptic number.

1630720663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1630720663 is a deficient number, since it is larger than the sum of its proper divisors (363486377).

1630720663 is a wasteful number, since it uses less digits than its factorization.

1630720663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 1630720663 is about 40382.1824942635. The cubic root of 1630720663 is about 1177.0453376639.

The spelling of 1630720663 in words is "one billion, six hundred thirty million, seven hundred twenty thousand, six hundred sixty-three".