29993239861639 has 2 divisors, whose sum is σ = 29993239861640. Its totient is φ = 29993239861638.

The previous prime is 29993239861603. The next prime is 29993239861693. The reversal of 29993239861639 is 93616893239992.

Together with next prime (29993239861693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 29993239861639 - 2²¹ = 29993237764487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29993239864639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14996619930819 + 14996619930820.

It is an arithmetic number, because the mean of its divisors is an integer number (14996619930820).

Almost surely, 2^{29993239861639} is an apocalyptic number.

29993239861639 is a deficient number, since it is larger than the sum of its proper divisors (1).

29993239861639 is an equidigital number, since it uses as much as digits as its factorization.

29993239861639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1836660096, while the sum is 79.

The spelling of 29993239861639 in words is "twenty-nine trillion, nine hundred ninety-three billion, two hundred thirty-nine million, eight hundred sixty-one thousand, six hundred thirty-nine".