66516650505 has 48 divisors (see below), whose sum is σ = 116883945360. Its totient is φ = 34989318144.

The previous prime is 66516650467. The next prime is 66516650539. The reversal of 66516650505 is 50505661566.

It can be written as a sum of positive squares in 8 ways, for example, as 18165917961 + 48350732544 = 134781^2 + 219888^2 .

It is not a de Polignac number, because 66516650505 - 2⁷ = 66516650377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1252941 + ... + 1304949.

It is an arithmetic number, because the mean of its divisors is an integer number (2435082195).

Almost surely, 2^66516650505 is an apocalyptic number.

It is an amenable number.

66516650505 is a deficient number, since it is larger than the sum of its proper divisors (50367294855).

66516650505 is a wasteful number, since it uses less digits than its factorization.

66516650505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52410 (or 52407 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 66516650505 in words is "sixty-six billion, five hundred sixteen million, six hundred fifty thousand, five hundred five".