7666540043 has 4 divisors (see below), whose sum is σ = 7702874568. Its totient is φ = 7630205520.

The previous prime is 7666540009. The next prime is 7666540051. The reversal of 7666540043 is 3400456667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3400456667 = 13159 ⋅258413.

It is a cyclic number.

It is not a de Polignac number, because 7666540043 - 2⁸ = 7666539787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7666540093) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 18166946 + ... + 18167367.

It is an arithmetic number, because the mean of its divisors is an integer number (1925718642).

Almost surely, 2^7666540043 is an apocalyptic number.

7666540043 is a deficient number, since it is larger than the sum of its proper divisors (36334525).

7666540043 is a wasteful number, since it uses less digits than its factorization.

7666540043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36334524.

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 7666540043 is about 87558.7805020148. The cubic root of 7666540043 is about 1971.8163775219.

The spelling of 7666540043 in words is "seven billion, six hundred sixty-six million, five hundred forty thousand, forty-three".