218545456 has 10 divisors (see below), whose sum is σ = 423431852. Its totient is φ = 109272720.

The previous prime is 218545427. The next prime is 218545507. The reversal of 218545456 is 654545812.

218545456 = T₁₂₀₆₉ + T₁₂₀₇₀ + T₁₂₀₇₁.

It is an alternating number because its digits alternate between even and odd.

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 as a sum of consecutive naturals, namely, 6829530 + ... + 6829561.

Almost surely, 2^218545456 is an apocalyptic number.

218545456 is the 12071-st centered triangular number.

It is an amenable number.

218545456 is a deficient number, since it is larger than the sum of its proper divisors (204886396).

218545456 is a wasteful number, since it uses less digits than its factorization.

218545456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13659099 (or 13659093 counting only the distinct ones).

The product of its digits is 192000, while the sum is 40.

The square root of 218545456 is about 14783.2829912709. The cubic root of 218545456 is about 602.3477055203.

The spelling of 218545456 in words is "two hundred eighteen million, five hundred forty-five thousand, four hundred fifty-six".