40218585640 has 32 divisors (see below), whose sum is σ = 90497745000. Its totient is φ = 16086380544.

The previous prime is 40218585619. The next prime is 40218585643. The reversal of 40218585640 is 4658581204.

40218585640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28514375044 + 11704210596 = 168862^2 + 108186^2 .

It is a super-3 number, since 3×40218585640³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (40218585643) 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, 941056 + ... + 982864.

Almost surely, 2^40218585640 is an apocalyptic number.

40218585640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40218585640 is an abundant number, since it is smaller than the sum of its proper divisors (50279159360).

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

40218585640 is a wasteful number, since it uses less digits than its factorization.

40218585640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65869 (or 65865 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 43.

The spelling of 40218585640 in words is "forty billion, two hundred eighteen million, five hundred eighty-five thousand, six hundred forty".