64505020066 has 4 divisors (see below), whose sum is σ = 96757530102. Its totient is φ = 32252510032.

The previous prime is 64505020057. The next prime is 64505020067. The reversal of 64505020066 is 66002050546.

64505020066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 56755915225 + 7749104841 = 238235^2 + 88029^2 .

It is a super-2 number, since 2×64505020066² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64505020067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16126255015 + ... + 16126255018.

Almost surely, 2^64505020066 is an apocalyptic number.

64505020066 is a deficient number, since it is larger than the sum of its proper divisors (32252510036).

64505020066 is a wasteful number, since it uses less digits than its factorization.

64505020066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32252510035.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 64505020066 in words is "sixty-four billion, five hundred five million, twenty thousand, sixty-six".