18958494985 has 8 divisors (see below), whose sum is σ = 22753793160. Its totient is φ = 15164396544.

The previous prime is 18958494959. The next prime is 18958495007. The reversal of 18958494985 is 58949485981.

It can be written as a sum of positive squares in 4 ways, for example, as 1203465481 + 17755029504 = 34691^2 + 133248^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18958494985 - 2¹⁵ = 18958462217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264792 + ... + 328681.

It is an arithmetic number, because the mean of its divisors is an integer number (2844224145).

Almost surely, 2^18958494985 is an apocalyptic number.

It is an amenable number.

18958494985 is a deficient number, since it is larger than the sum of its proper divisors (3795298175).

18958494985 is an equidigital number, since it uses as much as digits as its factorization.

18958494985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599867.

The product of its digits is 149299200, while the sum is 70.

The spelling of 18958494985 in words is "eighteen billion, nine hundred fifty-eight million, four hundred ninety-four thousand, nine hundred eighty-five".