158093721581 has 2 divisors, whose sum is σ = 158093721582. Its totient is φ = 158093721580.

The previous prime is 158093721559. The next prime is 158093721613. The reversal of 158093721581 is 185127390851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104367117481 + 53726604100 = 323059^2 + 231790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158093721581 is a prime.

It is a super-2 number, since 2×158093721581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158093721481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79046860790 + 79046860791.

It is an arithmetic number, because the mean of its divisors is an integer number (79046860791).

Almost surely, 2^158093721581 is an apocalyptic number.

It is an amenable number.

158093721581 is a deficient number, since it is larger than the sum of its proper divisors (1).

158093721581 is an equidigital number, since it uses as much as digits as its factorization.

158093721581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 50.

The spelling of 158093721581 in words is "one hundred fifty-eight billion, ninety-three million, seven hundred twenty-one thousand, five hundred eighty-one".