65399685120 has 880 divisors, whose sum is σ = 292326141888. Its totient is φ = 13589544960.

The previous prime is 65399685103. The next prime is 65399685121. The reversal of 65399685120 is 2158699356.

It is a happy number.

65399685120 is a `hidden beast` number, since 6 + 5 + 39 + 96 + 8 + 512 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (880).

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 (65399685121) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5945425915 + ... + 5945425925.

Almost surely, 2^65399685120 is an apocalyptic number.

65399685120 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 65399685120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146163070944).

65399685120 is an abundant number, since it is smaller than the sum of its proper divisors (226926456768).

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

65399685120 is an frugal number, since it uses more digits than its factorization.

65399685120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 65399685120 in words is "sixty-five billion, three hundred ninety-nine million, six hundred eighty-five thousand, one hundred twenty".