55666523669 has 2 divisors, whose sum is σ = 55666523670. Its totient is φ = 55666523668.

The previous prime is 55666523629. The next prime is 55666523677. The reversal of 55666523669 is 96632566655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54844956100 + 821567569 = 234190^2 + 28663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55666523669 is a prime.

It is a super-2 number, since 2×55666523669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55666523629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27833261834 + 27833261835.

It is an arithmetic number, because the mean of its divisors is an integer number (27833261835).

Almost surely, 2^55666523669 is an apocalyptic number.

It is an amenable number.

55666523669 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666523669 is an equidigital number, since it uses as much as digits as its factorization.

55666523669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488000, while the sum is 59.

The spelling of 55666523669 in words is "fifty-five billion, six hundred sixty-six million, five hundred twenty-three thousand, six hundred sixty-nine".