66540266116 has 27 divisors (see below), whose sum is σ = 117701976847. Its totient is φ = 32914930400.

The previous prime is 66540266063. The next prime is 66540266171. The reversal of 66540266116 is 61166204566.

The square root of 66540266116 is 257954.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 30628500100 + 35911766016 = 175010^2 + 189504^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 52106070 + ... + 52107346.

Almost surely, 2^66540266116 is an apocalyptic number.

66540266116 is the 257954-th square number.

It is an amenable number.

66540266116 is a deficient number, since it is larger than the sum of its proper divisors (51161710731).

66540266116 is an equidigital number, since it uses as much as digits as its factorization.

66540266116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760 (or 1380 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 66540266116 in words is "sixty-six billion, five hundred forty million, two hundred sixty-six thousand, one hundred sixteen".