64640046606044 has 72 divisors (see below), whose sum is σ = 141432880383648. Its totient is φ = 25308258693120.

The previous prime is 64640046606043. The next prime is 64640046606059. The reversal of 64640046606044 is 44060664004646.

It is a junction number, because it is equal to n+sod(n) for n = 64640046605983 and 64640046606001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640046606043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69954377 + ... + 70872384.

It is an arithmetic number, because the mean of its divisors is an integer number (1964345560884).

Almost surely, 2^{64640046606044} is an apocalyptic number.

It is an amenable number.

64640046606044 is an abundant number, since it is smaller than the sum of its proper divisors (76792833777604).

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

64640046606044 is a wasteful number, since it uses less digits than its factorization.

64640046606044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140826895 (or 140826880 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 64640046606044 in words is "sixty-four trillion, six hundred forty billion, forty-six million, six hundred six thousand, forty-four".