663364635420 has 96 divisors (see below), whose sum is σ = 1956552998400. Its totient is φ = 167469168384.

The previous prime is 663364635419. The next prime is 663364635457. The reversal of 663364635420 is 24536463366.

663364635420 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 663364635420.

It is a congruent number.

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, 1425457 + ... + 1832663.

It is an arithmetic number, because the mean of its divisors is an integer number (20380760400).

Almost surely, 2^663364635420 is an apocalyptic number.

663364635420 is a gapful number since it is divisible by the number (60) 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 663364635420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978276499200).

663364635420 is an abundant number, since it is smaller than the sum of its proper divisors (1293188362980).

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

663364635420 is a wasteful number, since it uses less digits than its factorization.

663364635420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408667 (or 408665 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 48.

The spelling of 663364635420 in words is "six hundred sixty-three billion, three hundred sixty-four million, six hundred thirty-five thousand, four hundred twenty".