64640640206220 has 48 divisors (see below), whose sum is σ = 194916392008800. Its totient is φ = 15911542204416.

The previous prime is 64640640206201. The next prime is 64640640206221. The reversal of 64640640206220 is 2260204604646.

It is not an unprimeable number, because it can be changed into a prime (64640640206221) 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, 41436307045 + ... + 41436308604.

It is an arithmetic number, because the mean of its divisors is an integer number (4060758166850).

Almost surely, 2^{64640640206220} is an apocalyptic number.

64640640206220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64640640206220 is an abundant number, since it is smaller than the sum of its proper divisors (130275751802580).

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

64640640206220 is a wasteful number, since it uses less digits than its factorization.

64640640206220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82872615674 (or 82872615672 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 64640640206220 in words is "sixty-four trillion, six hundred forty billion, six hundred forty million, two hundred six thousand, two hundred twenty".