40399321543680 has 1408 divisors, whose sum is σ = 151177782067200. Its totient is φ = 9099804672000.

The previous prime is 40399321543661. The next prime is 40399321543687. The reversal of 40399321543680 is 8634512399304.

It is a tau number, because it is divible by the number of its divisors (1408).

It is a self number, because there is not a number n which added to its sum of digits gives 40399321543680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40399321543687) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 115757368146 + ... + 115757368494.

Almost surely, 2^{40399321543680} is an apocalyptic number.

40399321543680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40399321543680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75588891033600).

40399321543680 is an abundant number, since it is smaller than the sum of its proper divisors (110778460523520).

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

40399321543680 is a wasteful number, since it uses less digits than its factorization.

40399321543680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 57.

The spelling of 40399321543680 in words is "forty trillion, three hundred ninety-nine billion, three hundred twenty-one million, five hundred forty-three thousand, six hundred eighty".