6660420044687 has 2 divisors, whose sum is σ = 6660420044688. Its totient is φ = 6660420044686.

The previous prime is 6660420044569. The next prime is 6660420044693. The reversal of 6660420044687 is 7864400240666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6660420044687 - 2³² = 6656125077391 is a prime.

It is a super-2 number, since 2×6660420044687² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6660420041687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330210022343 + 3330210022344.

It is an arithmetic number, because the mean of its divisors is an integer number (3330210022344).

Almost surely, 2^{6660420044687} is an apocalyptic number.

6660420044687 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660420044687 is an equidigital number, since it uses as much as digits as its factorization.

6660420044687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9289728, while the sum is 53.

The spelling of 6660420044687 in words is "six trillion, six hundred sixty billion, four hundred twenty million, forty-four thousand, six hundred eighty-seven".