158167904221 has 2 divisors, whose sum is σ = 158167904222. Its totient is φ = 158167904220.

The previous prime is 158167904189. The next prime is 158167904267. The reversal of 158167904221 is 122409761851.

It is an a-pointer prime, because the next prime (158167904267) can be obtained adding 158167904221 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110482447321 + 47685456900 = 332389^2 + 218370^2 .

It is a cyclic number.

It is not a de Polignac number, because 158167904221 - 2⁵ = 158167904189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158167914221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79083952110 + 79083952111.

It is an arithmetic number, because the mean of its divisors is an integer number (79083952111).

Almost surely, 2^158167904221 is an apocalyptic number.

It is an amenable number.

158167904221 is a deficient number, since it is larger than the sum of its proper divisors (1).

158167904221 is an equidigital number, since it uses as much as digits as its factorization.

158167904221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 158167904221 in words is "one hundred fifty-eight billion, one hundred sixty-seven million, nine hundred four thousand, two hundred twenty-one".