29685389557 has 8 divisors (see below), whose sum is σ = 29792568600. Its totient is φ = 29578374144.

The previous prime is 29685389543. The next prime is 29685389561. The reversal of 29685389557 is 75598358692.

It can be written as a sum of positive squares in 4 ways, for example, as 6296581201 + 23388808356 = 79351^2 + 152934^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29685389557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 29685389492 and 29685389501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29685389057) 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 7 ways as a sum of consecutive naturals, for example, 328569 + ... + 409057.

It is an arithmetic number, because the mean of its divisors is an integer number (3724071075).

Almost surely, 2^29685389557 is an apocalyptic number.

It is an amenable number.

29685389557 is a deficient number, since it is larger than the sum of its proper divisors (107179043).

29685389557 is an equidigital number, since it uses as much as digits as its factorization.

29685389557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81815.

The product of its digits is 163296000, while the sum is 67.

The spelling of 29685389557 in words is "twenty-nine billion, six hundred eighty-five million, three hundred eighty-nine thousand, five hundred fifty-seven".