64650080020 has 48 divisors (see below), whose sum is σ = 142835405328. Its totient is φ = 24547415040.

The previous prime is 64650080003. The next prime is 64650080021. The reversal of 64650080020 is 2008005646.

It can be written as a sum of positive squares in 8 ways, for example, as 5144332176 + 59505747844 = 71724^2 + 243938^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64650080021) 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, 1035087 + ... + 1095766.

It is an arithmetic number, because the mean of its divisors is an integer number (2975737611).

Almost surely, 2^64650080020 is an apocalyptic number.

It is an amenable number.

64650080020 is an abundant number, since it is smaller than the sum of its proper divisors (78185325308).

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

64650080020 is a wasteful number, since it uses less digits than its factorization.

64650080020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130940 (or 2130938 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 64650080020 its reverse (2008005646), we get a palindrome (66658085666).

The spelling of 64650080020 in words is "sixty-four billion, six hundred fifty million, eighty thousand, twenty".