9118506557 has 2 divisors, whose sum is σ = 9118506558. Its totient is φ = 9118506556.

The previous prime is 9118506539. The next prime is 9118506583. The reversal of 9118506557 is 7556058119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6752073241 + 2366433316 = 82171^2 + 48646^2 .

It is a cyclic number.

It is not a de Polignac number, because 9118506557 - 2²⁰ = 9117457981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118506557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4559253278 + 4559253279.

It is an arithmetic number, because the mean of its divisors is an integer number (4559253279).

Almost surely, 2^9118506557 is an apocalyptic number.

It is an amenable number.

9118506557 is a deficient number, since it is larger than the sum of its proper divisors (1).

9118506557 is an equidigital number, since it uses as much as digits as its factorization.

9118506557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378000, while the sum is 47.

The square root of 9118506557 is about 95490.8715899064. The cubic root of 9118506557 is about 2089.1738038401.

The spelling of 9118506557 in words is "nine billion, one hundred eighteen million, five hundred six thousand, five hundred fifty-seven".