64645211305020 has 48 divisors (see below), whose sum is σ = 181008618779520. Its totient is φ = 17238529955136.

The previous prime is 64645211305009. The next prime is 64645211305039. The reversal of 64645211305020 is 2050311254646.

It is a super-2 number, since 2×64645211305020² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64645211305020.

It is a congruent number.

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, 590350 + ... + 11385909.

It is an arithmetic number, because the mean of its divisors is an integer number (3771012891240).

Almost surely, 2^{64645211305020} is an apocalyptic number.

64645211305020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64645211305020 is an abundant number, since it is smaller than the sum of its proper divisors (116363407474500).

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

64645211305020 is a wasteful number, since it uses less digits than its factorization.

64645211305020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12066234 (or 12066232 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 64645211305020 its reverse (2050311254646), we get a palindrome (66695522559666).

The spelling of 64645211305020 in words is "sixty-four trillion, six hundred forty-five billion, two hundred eleven million, three hundred five thousand, twenty".