6660566541 has 6 divisors (see below), whose sum is σ = 9620818350. Its totient is φ = 4440377688.

The previous prime is 6660566533. The next prime is 6660566557. The reversal of 6660566541 is 1456650666.

6660566541 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6521208516 + 139358025 = 80754^2 + 11805^2 .

It is not a de Polignac number, because 6660566541 - 2³ = 6660566533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660566441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 370031466 + ... + 370031483.

It is an arithmetic number, because the mean of its divisors is an integer number (1603469725).

Almost surely, 2^6660566541 is an apocalyptic number.

It is an amenable number.

6660566541 is a deficient number, since it is larger than the sum of its proper divisors (2960251809).

6660566541 is a wasteful number, since it uses less digits than its factorization.

6660566541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740062955 (or 740062952 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 6660566541 is about 81612.2940554914. The cubic root of 6660566541 is about 1881.4978387827.

The spelling of 6660566541 in words is "six billion, six hundred sixty million, five hundred sixty-six thousand, five hundred forty-one".