3129685663 has 16 divisors (see below), whose sum is σ = 3465345856. Its totient is φ = 2807758080.

The previous prime is 3129685619. The next prime is 3129685673. The reversal of 3129685663 is 3665869213.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3129685663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3129685673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508243 + ... + 514363.

It is an arithmetic number, because the mean of its divisors is an integer number (216584116).

Almost surely, 2^3129685663 is an apocalyptic number.

3129685663 is a deficient number, since it is larger than the sum of its proper divisors (335660193).

3129685663 is a wasteful number, since it uses less digits than its factorization.

3129685663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7234.

The product of its digits is 1399680, while the sum is 49.

The square root of 3129685663 is about 55943.5935831798. The cubic root of 3129685663 is about 1462.7392221533.

The spelling of 3129685663 in words is "three billion, one hundred twenty-nine million, six hundred eighty-five thousand, six hundred sixty-three".