66502050660 has 36 divisors (see below), whose sum is σ = 201722887548. Its totient is φ = 17733880128.

The previous prime is 66502050623. The next prime is 66502050673. The reversal of 66502050660 is 6605020566.

It can be written as a sum of positive squares in 2 ways, for example, as 42373399104 + 24128651556 = 205848^2 + 155334^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184727739 + ... + 184728098.

It is an arithmetic number, because the mean of its divisors is an integer number (5603413543).

Almost surely, 2^66502050660 is an apocalyptic number.

66502050660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66502050660 is an abundant number, since it is smaller than the sum of its proper divisors (135220836888).

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

66502050660 is a wasteful number, since it uses less digits than its factorization.

66502050660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369455852 (or 369455847 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

It can be divided in two parts, 665020506 and 60, that added together give a palindrome (665020566).

The spelling of 66502050660 in words is "sixty-six billion, five hundred two million, fifty thousand, six hundred sixty".