158428326521 has 2 divisors, whose sum is σ = 158428326522. Its totient is φ = 158428326520.

The previous prime is 158428326517. The next prime is 158428326533. The reversal of 158428326521 is 125623824851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125291221225 + 33137105296 = 353965^2 + 182036^2 .

It is a cyclic number.

It is not a de Polignac number, because 158428326521 - 2² = 158428326517 is a prime.

It is not a weakly prime, because it can be changed into another prime (158428328521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79214163260 + 79214163261.

It is an arithmetic number, because the mean of its divisors is an integer number (79214163261).

Almost surely, 2^158428326521 is an apocalyptic number.

It is an amenable number.

158428326521 is a deficient number, since it is larger than the sum of its proper divisors (1).

158428326521 is an equidigital number, since it uses as much as digits as its factorization.

158428326521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 921600, while the sum is 47.

The spelling of 158428326521 in words is "one hundred fifty-eight billion, four hundred twenty-eight million, three hundred twenty-six thousand, five hundred twenty-one".