66557763662879 has 2 divisors, whose sum is σ = 66557763662880. Its totient is φ = 66557763662878.

The previous prime is 66557763662861. The next prime is 66557763662963. The reversal of 66557763662879 is 97826636775566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66557763662879 - 2¹⁶ = 66557763597343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66557763662797 and 66557763662806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66557763662809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33278881831439 + 33278881831440.

It is an arithmetic number, because the mean of its divisors is an integer number (33278881831440).

Almost surely, 2^{66557763662879} is an apocalyptic number.

66557763662879 is a deficient number, since it is larger than the sum of its proper divisors (1).

66557763662879 is an equidigital number, since it uses as much as digits as its factorization.

66557763662879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28805414400, while the sum is 83.

The spelling of 66557763662879 in words is "sixty-six trillion, five hundred fifty-seven billion, seven hundred sixty-three million, six hundred sixty-two thousand, eight hundred seventy-nine".