64565903220 has 96 divisors (see below), whose sum is σ = 222504054528. Its totient is φ = 13622694912.

The previous prime is 64565903203. The next prime is 64565903221. The reversal of 64565903220 is 2230956546.

It is a happy number.

It is a super-2 number, since 2×64565903220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64565903221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5907169 + ... + 5918088.

It is an arithmetic number, because the mean of its divisors is an integer number (2317750568).

Almost surely, 2^64565903220 is an apocalyptic number.

64565903220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64565903220 is an abundant number, since it is smaller than the sum of its proper divisors (157938151308).

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

64565903220 is a wasteful number, since it uses less digits than its factorization.

64565903220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11825289 (or 11825287 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 64565903220 in words is "sixty-four billion, five hundred sixty-five million, nine hundred three thousand, two hundred twenty".