218144553 has 8 divisors (see below), whose sum is σ = 317301216. Its totient is φ = 132208800.

The previous prime is 218144543. The next prime is 218144569. The reversal of 218144553 is 355441812.

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

It is not a de Polignac number, because 218144553 - 2¹² = 218140457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 6610441 = 218144553 / (2 + 1 + 8 + 1 + 4 + 4 + 5 + 5 + 3).

It is not an unprimeable number, because it can be changed into a prime (218144533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3305188 + ... + 3305253.

It is an arithmetic number, because the mean of its divisors is an integer number (39662652).

Almost surely, 2^218144553 is an apocalyptic number.

It is an amenable number.

218144553 is a deficient number, since it is larger than the sum of its proper divisors (99156663).

218144553 is a wasteful number, since it uses less digits than its factorization.

218144553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610455.

The product of its digits is 19200, while the sum is 33.

The square root of 218144553 is about 14769.7174312849. The cubic root of 218144553 is about 601.9791615764.

The spelling of 218144553 in words is "two hundred eighteen million, one hundred forty-four thousand, five hundred fifty-three".