40646418521 has 48 divisors (see below), whose sum is σ = 44601492672. Its totient is φ = 36998881920.

The previous prime is 40646418517. The next prime is 40646418523. The reversal of 40646418521 is 12581464604.

40646418521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40646418521 - 2² = 40646418517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40646418523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 146737835 + ... + 146738111.

It is an arithmetic number, because the mean of its divisors is an integer number (929197764).

Almost surely, 2^40646418521 is an apocalyptic number.

It is an amenable number.

40646418521 is a deficient number, since it is larger than the sum of its proper divisors (3955074151).

40646418521 is a wasteful number, since it uses less digits than its factorization.

40646418521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 40646418521 in words is "forty billion, six hundred forty-six million, four hundred eighteen thousand, five hundred twenty-one".