69138431993 has 2 divisors, whose sum is σ = 69138431994. Its totient is φ = 69138431992.

The previous prime is 69138431983. The next prime is 69138432019. The reversal of 69138431993 is 39913483196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60482548624 + 8655883369 = 245932^2 + 93037^2 .

It is a cyclic number.

It is not a de Polignac number, because 69138431993 - 2⁴ = 69138431977 is a prime.

It is not a weakly prime, because it can be changed into another prime (69138431983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34569215996 + 34569215997.

It is an arithmetic number, because the mean of its divisors is an integer number (34569215997).

Almost surely, 2^69138431993 is an apocalyptic number.

It is an amenable number.

69138431993 is a deficient number, since it is larger than the sum of its proper divisors (1).

69138431993 is an equidigital number, since it uses as much as digits as its factorization.

69138431993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 56.

The spelling of 69138431993 in words is "sixty-nine billion, one hundred thirty-eight million, four hundred thirty-one thousand, nine hundred ninety-three".