18577528397 has 2 divisors, whose sum is σ = 18577528398. Its totient is φ = 18577528396.

The previous prime is 18577528393. The next prime is 18577528457. The reversal of 18577528397 is 79382577581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18541179556 + 36348841 = 136166^2 + 6029^2 .

It is a cyclic number.

It is not a de Polignac number, because 18577528397 - 2² = 18577528393 is a prime.

It is a super-2 number, since 2×18577528397² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18577528391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9288764198 + 9288764199.

It is an arithmetic number, because the mean of its divisors is an integer number (9288764199).

Almost surely, 2^18577528397 is an apocalyptic number.

It is an amenable number.

18577528397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18577528397 is an equidigital number, since it uses as much as digits as its factorization.

18577528397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29635200, while the sum is 62.

The spelling of 18577528397 in words is "eighteen billion, five hundred seventy-seven million, five hundred twenty-eight thousand, three hundred ninety-seven".