218020297440 has 144 divisors (see below), whose sum is σ = 754872958224. Its totient is φ = 52853391360.

The previous prime is 218020297433. The next prime is 218020297447. The reversal of 218020297440 is 44792020812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (218020297433) and next prime (218020297447).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218020297447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1818817 + ... + 1934976.

It is an arithmetic number, because the mean of its divisors is an integer number (5242173321).

Almost surely, 2^218020297440 is an apocalyptic number.

218020297440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218020297440 is an abundant number, since it is smaller than the sum of its proper divisors (536852660784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218020297440 is a wasteful number, since it uses less digits than its factorization.

218020297440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753833 (or 3753814 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 218020297440 in words is "two hundred eighteen billion, twenty million, two hundred ninety-seven thousand, four hundred forty".