29991678089 has 2 divisors, whose sum is σ = 29991678090. Its totient is φ = 29991678088.

The previous prime is 29991678053. The next prime is 29991678091. The reversal of 29991678089 is 98087619992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24169988089 + 5821690000 = 155467^2 + 76300^2 .

It is a cyclic number.

It is not a de Polignac number, because 29991678089 - 2¹² = 29991673993 is a prime.

Together with 29991678091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (29991678589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995839044 + 14995839045.

It is an arithmetic number, because the mean of its divisors is an integer number (14995839045).

Almost surely, 2^29991678089 is an apocalyptic number.

It is an amenable number.

29991678089 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991678089 is an equidigital number, since it uses as much as digits as its factorization.

29991678089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35271936, while the sum is 68.

The spelling of 29991678089 in words is "twenty-nine billion, nine hundred ninety-one million, six hundred seventy-eight thousand, eighty-nine".