63643157 has 2 divisors, whose sum is σ = 63643158. Its totient is φ = 63643156.

The previous prime is 63643117. The next prime is 63643169. The reversal of 63643157 is 75134636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47969476 + 15673681 = 6926^2 + 3959^2 .

It is a cyclic number.

It is not a de Polignac number, because 63643157 - 2¹⁰ = 63642133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63643117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31821578 + 31821579.

It is an arithmetic number, because the mean of its divisors is an integer number (31821579).

Almost surely, 2^63643157 is an apocalyptic number.

It is an amenable number.

63643157 is a deficient number, since it is larger than the sum of its proper divisors (1).

63643157 is an equidigital number, since it uses as much as digits as its factorization.

63643157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 35.

The square root of 63643157 is about 7977.6661374114. Note that the first 3 decimals coincide. The cubic root of 63643157 is about 399.2551910933.

The spelling of 63643157 in words is "sixty-three million, six hundred forty-three thousand, one hundred fifty-seven".