18428312657 has 4 divisors (see below), whose sum is σ = 18430696116. Its totient is φ = 18425929200.

The previous prime is 18428312627. The next prime is 18428312663. The reversal of 18428312657 is 75621382481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75621382481 = 8731 ⋅8661251.

It can be written as a sum of positive squares in 2 ways, for example, as 12436933441 + 5991379216 = 111521^2 + 77404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18428312657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18428312627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180094 + ... + 1195607.

It is an arithmetic number, because the mean of its divisors is an integer number (4607674029).

Almost surely, 2^18428312657 is an apocalyptic number.

It is an amenable number.

18428312657 is a deficient number, since it is larger than the sum of its proper divisors (2383459).

18428312657 is an equidigital number, since it uses as much as digits as its factorization.

18428312657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383458.

The product of its digits is 645120, while the sum is 47.

The spelling of 18428312657 in words is "eighteen billion, four hundred twenty-eight million, three hundred twelve thousand, six hundred fifty-seven".