6403823694450 has 768 divisors, whose sum is σ = 22781901864960. Its totient is φ = 1285585551360.

The previous prime is 6403823694421. The next prime is 6403823694451. The reversal of 6403823694450 is 544963283046.

6403823694450 is a `hidden beast` number, since 6 + 40 + 38 + 2 + 36 + 94 + 450 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (6403823694451) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 545325279 + ... + 545337021.

It is an arithmetic number, because the mean of its divisors is an integer number (29663934720).

Almost surely, 2^{6403823694450} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6403823694450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11390950932480).

6403823694450 is an abundant number, since it is smaller than the sum of its proper divisors (16378078170510).

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

6403823694450 is a wasteful number, since it uses less digits than its factorization.

6403823694450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12000 (or 11989 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 54.

The spelling of 6403823694450 in words is "six trillion, four hundred three billion, eight hundred twenty-three million, six hundred ninety-four thousand, four hundred fifty".