145556218 has 8 divisors (see below), whose sum is σ = 219541140. Its totient is φ = 72375840.

The previous prime is 145556209. The next prime is 145556221. The reversal of 145556218 is 812655541.

It can be written as a sum of positive squares in 2 ways, for example, as 141919569 + 3636649 = 11913^2 + 1907^2 .

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

It is a super-2 number, since 2×145556218² = 42373225196927048, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200683 + ... + 201406.

Almost surely, 2^145556218 is an apocalyptic number.

145556218 is a deficient number, since it is larger than the sum of its proper divisors (73984922).

145556218 is a wasteful number, since it uses less digits than its factorization.

145556218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402272.

The product of its digits is 48000, while the sum is 37.

The square root of 145556218 is about 12064.6681678362. The cubic root of 145556218 is about 526.0296864796.

The spelling of 145556218 in words is "one hundred forty-five million, five hundred fifty-six thousand, two hundred eighteen".