64642442220620 has 96 divisors (see below), whose sum is σ = 148321915934976. Its totient is φ = 23469543417600.

The previous prime is 64642442220617. The next prime is 64642442220647. The reversal of 64642442220620 is 2602224424646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550010102 + ... + 550127618.

It is an arithmetic number, because the mean of its divisors is an integer number (1545019957656).

Almost surely, 2^{64642442220620} is an apocalyptic number.

It is an amenable number.

64642442220620 is an abundant number, since it is smaller than the sum of its proper divisors (83679473714356).

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

64642442220620 is a wasteful number, since it uses less digits than its factorization.

64642442220620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121431 (or 121429 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 44.

The spelling of 64642442220620 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-two million, two hundred twenty thousand, six hundred twenty".