158268779917 has 2 divisors, whose sum is σ = 158268779918. Its totient is φ = 158268779916.

The previous prime is 158268779899. The next prime is 158268779939. The reversal of 158268779917 is 719977862851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85594864356 + 72673915561 = 292566^2 + 269581^2 .

It is a cyclic number.

It is not a de Polignac number, because 158268779917 - 2⁷ = 158268779789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158268777917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79134389958 + 79134389959.

It is an arithmetic number, because the mean of its divisors is an integer number (79134389959).

Almost surely, 2^158268779917 is an apocalyptic number.

It is an amenable number.

158268779917 is a deficient number, since it is larger than the sum of its proper divisors (1).

158268779917 is an equidigital number, since it uses as much as digits as its factorization.

158268779917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 106686720, while the sum is 70.

The spelling of 158268779917 in words is "one hundred fifty-eight billion, two hundred sixty-eight million, seven hundred seventy-nine thousand, nine hundred seventeen".