65633285489940 has 576 divisors, whose sum is σ = 237734420152320. Its totient is φ = 14341499504640.

The previous prime is 65633285489939. The next prime is 65633285489963. The reversal of 65633285489940 is 4998458233656.

65633285489940 is a `hidden beast` number, since 6 + 5 + 6 + 3 + 32 + 8 + 548 + 9 + 9 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1645460677 + ... + 1645500563.

It is an arithmetic number, because the mean of its divisors is an integer number (412733368320).

Almost surely, 2^{65633285489940} is an apocalyptic number.

65633285489940 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 65633285489940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118867210076160).

65633285489940 is an abundant number, since it is smaller than the sum of its proper divisors (172101134662380).

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

65633285489940 is a wasteful number, since it uses less digits than its factorization.

65633285489940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40452 (or 40447 counting only the distinct ones).

The product of its (nonzero) digits is 1343692800, while the sum is 72.

The spelling of 65633285489940 in words is "sixty-five trillion, six hundred thirty-three billion, two hundred eighty-five million, four hundred eighty-nine thousand, nine hundred forty".