157996396813 has 2 divisors, whose sum is σ = 157996396814. Its totient is φ = 157996396812.

The previous prime is 157996396799. The next prime is 157996396837. The reversal of 157996396813 is 318693699751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147515141929 + 10481254884 = 384077^2 + 102378^2 .

It is a cyclic number.

It is not a de Polignac number, because 157996396813 - 2¹⁷ = 157996265741 is a prime.

It is a super-2 number, since 2×157996396813² (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 (157996396843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78998198406 + 78998198407.

It is an arithmetic number, because the mean of its divisors is an integer number (78998198407).

Almost surely, 2^157996396813 is an apocalyptic number.

It is an amenable number.

157996396813 is a deficient number, since it is larger than the sum of its proper divisors (1).

157996396813 is an equidigital number, since it uses as much as digits as its factorization.

157996396813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66134880, while the sum is 67.

The spelling of 157996396813 in words is "one hundred fifty-seven billion, nine hundred ninety-six million, three hundred ninety-six thousand, eight hundred thirteen".