8143697557 has 2 divisors, whose sum is σ = 8143697558. Its totient is φ = 8143697556.

The previous prime is 8143697519. The next prime is 8143697591. The reversal of 8143697557 is 7557963418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4618425681 + 3525271876 = 67959^2 + 59374^2 .

It is a cyclic number.

It is not a de Polignac number, because 8143697557 - 2²³ = 8135308949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8143697498 and 8143697507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8143691557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4071848778 + 4071848779.

It is an arithmetic number, because the mean of its divisors is an integer number (4071848779).

Almost surely, 2^8143697557 is an apocalyptic number.

It is an amenable number.

8143697557 is a deficient number, since it is larger than the sum of its proper divisors (1).

8143697557 is an equidigital number, since it uses as much as digits as its factorization.

8143697557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 55.

The square root of 8143697557 is about 90242.4376720842. The cubic root of 8143697557 is about 2011.9038055586.

The spelling of 8143697557 in words is "eight billion, one hundred forty-three million, six hundred ninety-seven thousand, five hundred fifty-seven".