29881505557 has 12 divisors (see below), whose sum is σ = 31932764640. Its totient is φ = 27955318976.

The previous prime is 29881505527. The next prime is 29881505581. The reversal of 29881505557 is 75550518892.

It is not a de Polignac number, because 29881505557 - 2¹⁹ = 29880981269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 29881505498 and 29881505507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29881505527) 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 11 ways as a sum of consecutive naturals, for example, 261307 + ... + 357832.

It is an arithmetic number, because the mean of its divisors is an integer number (2661063720).

Almost surely, 2^29881505557 is an apocalyptic number.

It is an amenable number.

29881505557 is a deficient number, since it is larger than the sum of its proper divisors (2051259083).

29881505557 is a wasteful number, since it uses less digits than its factorization.

29881505557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619340 (or 619323 counting only the distinct ones).

The product of its (nonzero) digits is 5040000, while the sum is 55.

The spelling of 29881505557 in words is "twenty-nine billion, eight hundred eighty-one million, five hundred five thousand, five hundred fifty-seven".