67644160043440 has 80 divisors (see below), whose sum is σ = 160662881872800. Its totient is φ = 26477096196096.

The previous prime is 67644160043431. The next prime is 67644160043441. The reversal of 67644160043440 is 4434006144676.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (67644160043441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19440285 + ... + 22654204.

It is an arithmetic number, because the mean of its divisors is an integer number (2008286023410).

Almost surely, 2^{67644160043440} is an apocalyptic number.

It is an amenable number.

67644160043440 is an abundant number, since it is smaller than the sum of its proper divisors (93018721829360).

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

67644160043440 is a wasteful number, since it uses less digits than its factorization.

67644160043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42094934 (or 42094928 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 49.

The spelling of 67644160043440 in words is "sixty-seven trillion, six hundred forty-four billion, one hundred sixty million, forty-three thousand, four hundred forty".