66879411497867 has 16 divisors (see below), whose sum is σ = 69291360381600. Its totient is φ = 64511083104000.

The previous prime is 66879411497863. The next prime is 66879411497881. The reversal of 66879411497867 is 76879411497866.

It is a cyclic number.

It is not a de Polignac number, because 66879411497867 - 2² = 66879411497863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66879411497863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1858367 + ... + 11713767.

It is an arithmetic number, because the mean of its divisors is an integer number (4330710023850).

Almost surely, 2^{66879411497867} is an apocalyptic number.

66879411497867 is a deficient number, since it is larger than the sum of its proper divisors (2411948883733).

66879411497867 is a wasteful number, since it uses less digits than its factorization.

66879411497867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9857614.

The product of its digits is 6145155072, while the sum is 83.

Subtracting 66879411497867 from its reverse (76879411497866), we obtain a palindrome (9999999999999).

The spelling of 66879411497867 in words is "sixty-six trillion, eight hundred seventy-nine billion, four hundred eleven million, four hundred ninety-seven thousand, eight hundred sixty-seven".