66666669999487 has 2 divisors, whose sum is σ = 66666669999488. Its totient is φ = 66666669999486.

The previous prime is 66666669999463. The next prime is 66666669999511. The reversal of 66666669999487 is 78499996666666.

It is a balanced prime because it is at equal distance from previous prime (66666669999463) and next prime (66666669999511).

It is a cyclic number.

It is not a de Polignac number, because 66666669999487 - 2³⁹ = 66116914185599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66666669993487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333334999743 + 33333334999744.

It is an arithmetic number, because the mean of its divisors is an integer number (33333334999744).

Almost surely, 2^{66666669999487} is an apocalyptic number.

66666669999487 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666669999487 is an equidigital number, since it uses as much as digits as its factorization.

66666669999487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 411411861504, while the sum is 97.

The spelling of 66666669999487 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred sixty-nine million, nine hundred ninety-nine thousand, four hundred eighty-seven".