64400440606 has 16 divisors (see below), whose sum is σ = 101748200400. Its totient is φ = 30486483648.

The previous prime is 64400440603. The next prime is 64400440607. The reversal of 64400440606 is 60604400446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64400440603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465505 + ... + 587788.

It is an arithmetic number, because the mean of its divisors is an integer number (6359262525).

Almost surely, 2^64400440606 is an apocalyptic number.

64400440606 is a deficient number, since it is larger than the sum of its proper divisors (37347759794).

64400440606 is a wasteful number, since it uses less digits than its factorization.

64400440606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054923.

The product of its (nonzero) digits is 55296, while the sum is 34.

The spelling of 64400440606 in words is "sixty-four billion, four hundred million, four hundred forty thousand, six hundred six".