7540660066 has 4 divisors (see below), whose sum is σ = 11310990102. Its totient is φ = 3770330032.

The previous prime is 7540660031. The next prime is 7540660073. The reversal of 7540660066 is 6600660457.

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., 7315209841 + 225450225 = 85529^2 + 15015^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1885165015 + ... + 1885165018.

Almost surely, 2^7540660066 is an apocalyptic number.

7540660066 is a deficient number, since it is larger than the sum of its proper divisors (3770330036).

7540660066 is a wasteful number, since it uses less digits than its factorization.

7540660066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770330035.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 7540660066 is about 86836.9740721082. The cubic root of 7540660066 is about 1960.9647536005.

The spelling of 7540660066 in words is "seven billion, five hundred forty million, six hundred sixty thousand, sixty-six".