6666555611503 has 4 divisors (see below), whose sum is σ = 6707454725848. Its totient is φ = 6625656497160.

The previous prime is 6666555611501. The next prime is 6666555611539. The reversal of 6666555611503 is 3051165556666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6666555611503 - 2¹ = 6666555611501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666555611501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20449556928 + ... + 20449557253.

It is an arithmetic number, because the mean of its divisors is an integer number (1676863681462).

Almost surely, 2^{6666555611503} is an apocalyptic number.

6666555611503 is a deficient number, since it is larger than the sum of its proper divisors (40899114345).

6666555611503 is a wasteful number, since it uses less digits than its factorization.

6666555611503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40899114344.

The product of its (nonzero) digits is 14580000, while the sum is 55.

The spelling of 6666555611503 in words is "six trillion, six hundred sixty-six billion, five hundred fifty-five million, six hundred eleven thousand, five hundred three".