158536717993 has 2 divisors, whose sum is σ = 158536717994. Its totient is φ = 158536717992.

The previous prime is 158536717951. The next prime is 158536718033. The reversal of 158536717993 is 399717635851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140751028224 + 17785689769 = 375168^2 + 133363^2 .

It is an emirp because it is prime and its reverse (399717635851) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158536717993 is a prime.

It is not a weakly prime, because it can be changed into another prime (158536715993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79268358996 + 79268358997.

It is an arithmetic number, because the mean of its divisors is an integer number (79268358997).

Almost surely, 2^158536717993 is an apocalyptic number.

It is an amenable number.

158536717993 is a deficient number, since it is larger than the sum of its proper divisors (1).

158536717993 is an equidigital number, since it uses as much as digits as its factorization.

158536717993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42865200, while the sum is 64.

The spelling of 158536717993 in words is "one hundred fifty-eight billion, five hundred thirty-six million, seven hundred seventeen thousand, nine hundred ninety-three".