158831198857 has 2 divisors, whose sum is σ = 158831198858. Its totient is φ = 158831198856.

The previous prime is 158831198837. The next prime is 158831198861. The reversal of 158831198857 is 758891138851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117257620041 + 41573578816 = 342429^2 + 203896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158831198857 is a prime.

It is not a weakly prime, because it can be changed into another prime (158831198837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79415599428 + 79415599429.

It is an arithmetic number, because the mean of its divisors is an integer number (79415599429).

Almost surely, 2^158831198857 is an apocalyptic number.

It is an amenable number.

158831198857 is a deficient number, since it is larger than the sum of its proper divisors (1).

158831198857 is an equidigital number, since it uses as much as digits as its factorization.

158831198857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19353600, while the sum is 64.

The spelling of 158831198857 in words is "one hundred fifty-eight billion, eight hundred thirty-one million, one hundred ninety-eight thousand, eight hundred fifty-seven".