40218565820 has 24 divisors (see below), whose sum is σ = 84486925824. Its totient is φ = 16082104896.

The previous prime is 40218565819. The next prime is 40218565841. The reversal of 40218565820 is 2856581204.

It is a happy number.

It is a congruent number.

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, 270332 + ... + 391811.

It is an arithmetic number, because the mean of its divisors is an integer number (3520288576).

Almost surely, 2^40218565820 is an apocalyptic number.

It is an amenable number.

40218565820 is an abundant number, since it is smaller than the sum of its proper divisors (44268360004).

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

40218565820 is a wasteful number, since it uses less digits than its factorization.

40218565820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665189 (or 665187 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 41.

The spelling of 40218565820 in words is "forty billion, two hundred eighteen million, five hundred sixty-five thousand, eight hundred twenty".