18488257066 has 4 divisors (see below), whose sum is σ = 27732385602. Its totient is φ = 9244128532.

The previous prime is 18488257013. The next prime is 18488257069. The reversal of 18488257066 is 66075288481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66075288481 = 23599 ⋅2799919.

It can be written as a sum of positive squares in only one way, i.e., 14666421025 + 3821836041 = 121105^2 + 61821^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18488256998 and 18488257016.

It is not an unprimeable number, because it can be changed into a prime (18488257069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4622064265 + ... + 4622064268.

Almost surely, 2^18488257066 is an apocalyptic number.

18488257066 is a deficient number, since it is larger than the sum of its proper divisors (9244128536).

18488257066 is an equidigital number, since it uses as much as digits as its factorization.

18488257066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9244128535.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 18488257066 in words is "eighteen billion, four hundred eighty-eight million, two hundred fifty-seven thousand, sixty-six".