18158257385 has 8 divisors (see below), whose sum is σ = 21801553800. Its totient is φ = 14518842624.

The previous prime is 18158257367. The next prime is 18158257391. The reversal of 18158257385 is 58375285181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13897984 + 18144359401 = 3728^2 + 134701^2 .

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 18158257385 - 2²⁰ = 18157208809 is a prime.

It is a super-2 number, since 2×18158257385² (a number of 21 digits) contains 22 as substring.

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, 960110 + ... + 978839.

It is an arithmetic number, because the mean of its divisors is an integer number (2725194225).

Almost surely, 2^18158257385 is an apocalyptic number.

It is an amenable number.

18158257385 is a deficient number, since it is larger than the sum of its proper divisors (3643296415).

18158257385 is a wasteful number, since it uses less digits than its factorization.

18158257385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940827.

The product of its digits is 2688000, while the sum is 53.

The spelling of 18158257385 in words is "eighteen billion, one hundred fifty-eight million, two hundred fifty-seven thousand, three hundred eighty-five".