64642446042440 has 64 divisors (see below), whose sum is σ = 173450538466560. Its totient is φ = 21199510252800.

The previous prime is 64642446042439. The next prime is 64642446042511. The reversal of 64642446042440 is 4424064424646.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5018817011 + ... + 5018829890.

It is an arithmetic number, because the mean of its divisors is an integer number (2710164663540).

Almost surely, 2^{64642446042440} is an apocalyptic number.

It is an amenable number.

64642446042440 is an abundant number, since it is smaller than the sum of its proper divisors (108808092424120).

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

64642446042440 is a wasteful number, since it uses less digits than its factorization.

64642446042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10037646942 (or 10037646938 counting only the distinct ones).

The product of its (nonzero) digits is 14155776, while the sum is 50.

The spelling of 64642446042440 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-six million, forty-two thousand, four hundred forty".