67664247840 has 144 divisors (see below), whose sum is σ = 263890605888. Its totient is φ = 15466111488.

The previous prime is 67664247839. The next prime is 67664247853. The reversal of 67664247840 is 4874246676.

67664247840 is a `hidden beast` number, since 6 + 76 + 64 + 2 + 478 + 40 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3346282 + ... + 3366441.

It is an arithmetic number, because the mean of its divisors is an integer number (1832573652).

Almost surely, 2^67664247840 is an apocalyptic number.

67664247840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

67664247840 is an abundant number, since it is smaller than the sum of its proper divisors (196226358048).

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

67664247840 is a wasteful number, since it uses less digits than its factorization.

67664247840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6712751 (or 6712740 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 54.

The spelling of 67664247840 in words is "sixty-seven billion, six hundred sixty-four million, two hundred forty-seven thousand, eight hundred forty".