64645550020 has 12 divisors (see below), whose sum is σ = 135755655084. Its totient is φ = 25858220000.

The previous prime is 64645550009. The next prime is 64645550023. The reversal of 64645550020 is 2005554646.

It can be written as a sum of positive squares in 2 ways, for example, as 42251624704 + 22393925316 = 205552^2 + 149646^2 .

It is not an unprimeable number, because it can be changed into a prime (64645550023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616138731 + ... + 1616138770.

It is an arithmetic number, because the mean of its divisors is an integer number (11312971257).

Almost surely, 2^64645550020 is an apocalyptic number.

It is an amenable number.

64645550020 is an abundant number, since it is smaller than the sum of its proper divisors (71110105064).

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

64645550020 is a wasteful number, since it uses less digits than its factorization.

64645550020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232277510 (or 3232277508 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 64645550020 in words is "sixty-four billion, six hundred forty-five million, five hundred fifty thousand, twenty".