66551255677 has 2 divisors, whose sum is σ = 66551255678. Its totient is φ = 66551255676.

The previous prime is 66551255653. The next prime is 66551255689. The reversal of 66551255677 is 77655215566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63514584441 + 3036671236 = 252021^2 + 55106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66551255677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66551255627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33275627838 + 33275627839.

It is an arithmetic number, because the mean of its divisors is an integer number (33275627839).

Almost surely, 2^66551255677 is an apocalyptic number.

It is an amenable number.

66551255677 is a deficient number, since it is larger than the sum of its proper divisors (1).

66551255677 is an equidigital number, since it uses as much as digits as its factorization.

66551255677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230000, while the sum is 55.

The spelling of 66551255677 in words is "sixty-six billion, five hundred fifty-one million, two hundred fifty-five thousand, six hundred seventy-seven".