40651321648 has 160 divisors (see below), whose sum is σ = 94951065600. Its totient is φ = 16492557312.

The previous prime is 40651321631. The next prime is 40651321661. The reversal of 40651321648 is 84612315604.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 40651321648.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79864818 + ... + 79865326.

It is an arithmetic number, because the mean of its divisors is an integer number (593444160).

Almost surely, 2^40651321648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40651321648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47475532800).

40651321648 is an abundant number, since it is smaller than the sum of its proper divisors (54299743952).

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

40651321648 is a wasteful number, since it uses less digits than its factorization.

40651321648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 40651321648 in words is "forty billion, six hundred fifty-one million, three hundred twenty-one thousand, six hundred forty-eight".