40128737618 has 24 divisors (see below), whose sum is σ = 65077413660. Its totient is φ = 18544717440.

The previous prime is 40128737611. The next prime is 40128737669. The reversal of 40128737618 is 81673782104.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39974803969 + 153933649 = 199937^2 + 12407^2 .

It is a super-2 number, since 2×40128737618² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40128737611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 648203 + ... + 707406.

Almost surely, 2^40128737618 is an apocalyptic number.

40128737618 is a deficient number, since it is larger than the sum of its proper divisors (24948676042).

40128737618 is a wasteful number, since it uses less digits than its factorization.

40128737618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355690 (or 1355671 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 40128737618 in words is "forty billion, one hundred twenty-eight million, seven hundred thirty-seven thousand, six hundred eighteen".