55666577129 has 8 divisors (see below), whose sum is σ = 59524658568. Its totient is φ = 51873337600.

The previous prime is 55666577119. The next prime is 55666577171. The reversal of 55666577129 is 92177566655.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26476171225 + 29190405904 = 162715^2 + 170852^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55666577129 - 2¹² = 55666573033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55666577119) 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 in 7 ways as a sum of consecutive naturals, for example, 16208702 + ... + 16212135.

It is an arithmetic number, because the mean of its divisors is an integer number (7440582321).

Almost surely, 2^55666577129 is an apocalyptic number.

It is an amenable number.

55666577129 is a deficient number, since it is larger than the sum of its proper divisors (3858081439).

55666577129 is a wasteful number, since it uses less digits than its factorization.

55666577129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32420955.

The product of its digits is 23814000, while the sum is 59.

The spelling of 55666577129 in words is "fifty-five billion, six hundred sixty-six million, five hundred seventy-seven thousand, one hundred twenty-nine".