8458998557 has 2 divisors, whose sum is σ = 8458998558. Its totient is φ = 8458998556.

The previous prime is 8458998547. The next prime is 8458998617. The reversal of 8458998557 is 7558998548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7954142596 + 504855961 = 89186^2 + 22469^2 .

It is a cyclic number.

It is not a de Polignac number, because 8458998557 - 2¹⁸ = 8458736413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8458998547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4229499278 + 4229499279.

It is an arithmetic number, because the mean of its divisors is an integer number (4229499279).

Almost surely, 2^8458998557 is an apocalyptic number.

It is an amenable number.

8458998557 is a deficient number, since it is larger than the sum of its proper divisors (1).

8458998557 is an equidigital number, since it uses as much as digits as its factorization.

8458998557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152000, while the sum is 68.

The square root of 8458998557 is about 91972.8142279011. The cubic root of 8458998557 is about 2037.5408144784.

Subtracting from 8458998557 its reverse (7558998548), we obtain a palindrome (900000009).

The spelling of 8458998557 in words is "eight billion, four hundred fifty-eight million, nine hundred ninety-eight thousand, five hundred fifty-seven".