64440006666442 has 16 divisors (see below), whose sum is σ = 105632604014400. Its totient is φ = 29239434238240.

The previous prime is 64440006666319. The next prime is 64440006666461. The reversal of 64440006666442 is 24466660004446.

It is a self number, because there is not a number n which added to its sum of digits gives 64440006666442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2573881342 + ... + 2573906377.

It is an arithmetic number, because the mean of its divisors is an integer number (6602037750900).

Almost surely, 2^{64440006666442} is an apocalyptic number.

64440006666442 is a deficient number, since it is larger than the sum of its proper divisors (41192597347958).

64440006666442 is a wasteful number, since it uses less digits than its factorization.

64440006666442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5147788301.

The product of its (nonzero) digits is 15925248, while the sum is 52.

The spelling of 64440006666442 in words is "sixty-four trillion, four hundred forty billion, six million, six hundred sixty-six thousand, four hundred forty-two".