79887888878939 has 2 divisors, whose sum is σ = 79887888878940. Its totient is φ = 79887888878938.

The previous prime is 79887888878867. The next prime is 79887888878951. The reversal of 79887888878939 is 93987888878897.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79887888878939 is a prime.

It is not a weakly prime, because it can be changed into another prime (79887888875939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39943944439469 + 39943944439470.

It is an arithmetic number, because the mean of its divisors is an integer number (39943944439470).

Almost surely, 2^{79887888878939} is an apocalyptic number.

79887888878939 is a deficient number, since it is larger than the sum of its proper divisors (1).

79887888878939 is an equidigital number, since it uses as much as digits as its factorization.

79887888878939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1573159698432, while the sum is 107.

The spelling of 79887888878939 in words is "seventy-nine trillion, eight hundred eighty-seven billion, eight hundred eighty-eight million, eight hundred seventy-eight thousand, nine hundred thirty-nine".