29991678589 has 2 divisors, whose sum is σ = 29991678590. Its totient is φ = 29991678588.

The previous prime is 29991678569. The next prime is 29991678599. The reversal of 29991678589 is 98587619992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26547162489 + 3444516100 = 162933^2 + 58690^2 .

It is a cyclic number.

It is not a de Polignac number, because 29991678589 - 2⁵ = 29991678557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29991678539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995839294 + 14995839295.

It is an arithmetic number, because the mean of its divisors is an integer number (14995839295).

Almost surely, 2^29991678589 is an apocalyptic number.

It is an amenable number.

29991678589 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991678589 is an equidigital number, since it uses as much as digits as its factorization.

29991678589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176359680, while the sum is 73.

The spelling of 29991678589 in words is "twenty-nine billion, nine hundred ninety-one million, six hundred seventy-eight thousand, five hundred eighty-nine".