29998399928639 has 2 divisors, whose sum is σ = 29998399928640. Its totient is φ = 29998399928638.

The previous prime is 29998399928593. The next prime is 29998399928659. The reversal of 29998399928639 is 93682999389992.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29998399928639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29998399928659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14999199964319 + 14999199964320.

It is an arithmetic number, because the mean of its divisors is an integer number (14999199964320).

Almost surely, 2^{29998399928639} is an apocalyptic number.

29998399928639 is a deficient number, since it is larger than the sum of its proper divisors (1).

29998399928639 is an equidigital number, since it uses as much as digits as its factorization.

29998399928639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66119763456, while the sum is 95.

The spelling of 29998399928639 in words is "twenty-nine trillion, nine hundred ninety-eight billion, three hundred ninety-nine million, nine hundred twenty-eight thousand, six hundred thirty-nine".