65994461280 has 144 divisors (see below), whose sum is σ = 245679439824. Its totient is φ = 15998653440.

The previous prime is 65994461263. The next prime is 65994461303. The reversal of 65994461280 is 8216449956.

65994461280 is a `hidden beast` number, since 6 + 599 + 4 + 46 + 1 + 2 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2067319 + ... + 2098998.

It is an arithmetic number, because the mean of its divisors is an integer number (1706107221).

Almost surely, 2^65994461280 is an apocalyptic number.

65994461280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65994461280 is an abundant number, since it is smaller than the sum of its proper divisors (179684978544).

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

65994461280 is a wasteful number, since it uses less digits than its factorization.

65994461280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166349 (or 4166338 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 65994461280 in words is "sixty-five billion, nine hundred ninety-four million, four hundred sixty-one thousand, two hundred eighty".