65984749920 has 576 divisors, whose sum is σ = 238634532864. Its totient is φ = 16582164480.

The previous prime is 65984749837. The next prime is 65984749931. The reversal of 65984749920 is 2994748956.

65984749920 is a `hidden beast` number, since 6 + 59 + 8 + 474 + 99 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 519564897 + ... + 519565023.

It is an arithmetic number, because the mean of its divisors is an integer number (414296064).

Almost surely, 2^65984749920 is an apocalyptic number.

65984749920 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 65984749920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119317266432).

65984749920 is an abundant number, since it is smaller than the sum of its proper divisors (172649782944).

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

65984749920 is a wasteful number, since it uses less digits than its factorization.

65984749920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 65984749920 in words is "sixty-five billion, nine hundred eighty-four million, seven hundred forty-nine thousand, nine hundred twenty".