8557519643 has 2 divisors, whose sum is σ = 8557519644. Its totient is φ = 8557519642.

The previous prime is 8557519637. The next prime is 8557519693. The reversal of 8557519643 is 3469157558.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8557519643 - 2¹⁴ = 8557503259 is a prime.

It is a super-2 number, since 2×8557519643² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (8557519613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4278759821 + 4278759822.

It is an arithmetic number, because the mean of its divisors is an integer number (4278759822).

Almost surely, 2^8557519643 is an apocalyptic number.

8557519643 is a deficient number, since it is larger than the sum of its proper divisors (1).

8557519643 is an equidigital number, since it uses as much as digits as its factorization.

8557519643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536000, while the sum is 53.

The square root of 8557519643 is about 92506.8626805601. The cubic root of 8557519643 is about 2045.4206440970.

The spelling of 8557519643 in words is "eight billion, five hundred fifty-seven million, five hundred nineteen thousand, six hundred forty-three".