55686639329 has 2 divisors, whose sum is σ = 55686639330. Its totient is φ = 55686639328.

The previous prime is 55686639319. The next prime is 55686639367. The reversal of 55686639329 is 92393668655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44360784400 + 11325854929 = 210620^2 + 106423^2 .

It is a cyclic number.

It is not a de Polignac number, because 55686639329 - 2¹² = 55686635233 is a prime.

It is not a weakly prime, because it can be changed into another prime (55686639319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27843319664 + 27843319665.

It is an arithmetic number, because the mean of its divisors is an integer number (27843319665).

Almost surely, 2^55686639329 is an apocalyptic number.

It is an amenable number.

55686639329 is a deficient number, since it is larger than the sum of its proper divisors (1).

55686639329 is an equidigital number, since it uses as much as digits as its factorization.

55686639329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62985600, while the sum is 62.

The spelling of 55686639329 in words is "fifty-five billion, six hundred eighty-six million, six hundred thirty-nine thousand, three hundred twenty-nine".