158319021173 has 2 divisors, whose sum is σ = 158319021174. Its totient is φ = 158319021172.

The previous prime is 158319021167. The next prime is 158319021227. The reversal of 158319021173 is 371120913851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134466689809 + 23852331364 = 366697^2 + 154442^2 .

It is a cyclic number.

It is not a de Polignac number, because 158319021173 - 2²⁰ = 158317972597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 158319021173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158319011173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79159510586 + 79159510587.

It is an arithmetic number, because the mean of its divisors is an integer number (79159510587).

Almost surely, 2^158319021173 is an apocalyptic number.

It is an amenable number.

158319021173 is a deficient number, since it is larger than the sum of its proper divisors (1).

158319021173 is an equidigital number, since it uses as much as digits as its factorization.

158319021173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 158319021173 in words is "one hundred fifty-eight billion, three hundred nineteen million, twenty-one thousand, one hundred seventy-three".