18258537643 has 4 divisors (see below), whose sum is σ = 18262700208. Its totient is φ = 18254375080.

The previous prime is 18258537641. The next prime is 18258537677. The reversal of 18258537643 is 34673585281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34673585281 = 31 ⋅1118502751.

It is a cyclic number.

It is not a de Polignac number, because 18258537643 - 2¹ = 18258537641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18258537641) 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, 2074696 + ... + 2083477.

It is an arithmetic number, because the mean of its divisors is an integer number (4565675052).

Almost surely, 2^18258537643 is an apocalyptic number.

18258537643 is a deficient number, since it is larger than the sum of its proper divisors (4162565).

18258537643 is an equidigital number, since it uses as much as digits as its factorization.

18258537643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162564.

The product of its digits is 4838400, while the sum is 52.

The spelling of 18258537643 in words is "eighteen billion, two hundred fifty-eight million, five hundred thirty-seven thousand, six hundred forty-three".