6631129394 has 8 divisors (see below), whose sum is σ = 10001648748. Its totient is φ = 3297246480.

The previous prime is 6631129387. The next prime is 6631129411. The reversal of 6631129394 is 4939211366.

It can be written as a sum of positive squares in 2 ways, for example, as 5923303369 + 707826025 = 76963^2 + 26605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9158657 + ... + 9159380.

Almost surely, 2^6631129394 is an apocalyptic number.

6631129394 is a deficient number, since it is larger than the sum of its proper divisors (3370519354).

6631129394 is a wasteful number, since it uses less digits than its factorization.

6631129394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18318220.

The product of its digits is 209952, while the sum is 44.

The square root of 6631129394 is about 81431.7468435990. The cubic root of 6631129394 is about 1878.7219125458.

The spelling of 6631129394 in words is "six billion, six hundred thirty-one million, one hundred twenty-nine thousand, three hundred ninety-four".