6666534511451 has 4 divisors (see below), whose sum is σ = 6666540699504. Its totient is φ = 6666528323400.

The previous prime is 6666534511237. The next prime is 6666534511471. The reversal of 6666534511451 is 1541154356666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6666534511451 - 2¹⁴ = 6666534495067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6666534511393 and 6666534511402.

It is not an unprimeable number, because it can be changed into a prime (6666534511471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010240 + ... + 3788621.

It is an arithmetic number, because the mean of its divisors is an integer number (1666635174876).

Almost surely, 2^{6666534511451} is an apocalyptic number.

6666534511451 is a deficient number, since it is larger than the sum of its proper divisors (6188053).

6666534511451 is a wasteful number, since it uses less digits than its factorization.

6666534511451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6188052.

The product of its digits is 7776000, while the sum is 53.

The spelling of 6666534511451 in words is "six trillion, six hundred sixty-six billion, five hundred thirty-four million, five hundred eleven thousand, four hundred fifty-one".