159857831257 has 4 divisors (see below), whose sum is σ = 159933992400. Its totient is φ = 159781670116.

The previous prime is 159857831251. The next prime is 159857831317. The reversal of 159857831257 is 752138758951.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 159857831257 - 2¹⁹ = 159857306969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 159857831195 and 159857831204.

It is not an unprimeable number, because it can be changed into a prime (159857831251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38077423 + ... + 38081620.

It is an arithmetic number, because the mean of its divisors is an integer number (39983498100).

Almost surely, 2^159857831257 is an apocalyptic number.

It is an amenable number.

159857831257 is a deficient number, since it is larger than the sum of its proper divisors (76161143).

159857831257 is an equidigital number, since it uses as much as digits as its factorization.

159857831257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76161142.

The product of its digits is 21168000, while the sum is 61.

The spelling of 159857831257 in words is "one hundred fifty-nine billion, eight hundred fifty-seven million, eight hundred thirty-one thousand, two hundred fifty-seven".