18487928474 has 4 divisors (see below), whose sum is σ = 27731892714. Its totient is φ = 9243964236.

The previous prime is 18487928449. The next prime is 18487928479. The reversal of 18487928474 is 47482978481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47482978481 = 22531 ⋅2107451.

It can be written as a sum of positive squares in only one way, i.e., 9423555625 + 9064372849 = 97075^2 + 95207^2 .

It is not an unprimeable number, because it can be changed into a prime (18487928479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4621982117 + ... + 4621982120.

Almost surely, 2^18487928474 is an apocalyptic number.

18487928474 is a deficient number, since it is larger than the sum of its proper divisors (9243964240).

18487928474 is an equidigital number, since it uses as much as digits as its factorization.

18487928474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9243964239.

The product of its digits is 28901376, while the sum is 62.

The spelling of 18487928474 in words is "eighteen billion, four hundred eighty-seven million, nine hundred twenty-eight thousand, four hundred seventy-four".