55156669 has 2 divisors, whose sum is σ = 55156670. Its totient is φ = 55156668.

The previous prime is 55156667. The next prime is 55156679. The reversal of 55156669 is 96665155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40487769 + 14668900 = 6363^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 55156669 - 2¹ = 55156667 is a prime.

It is a super-2 number, since 2×55156669² = 6084516270351122, which contains 22 as substring.

Together with 55156667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55156667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27578334 + 27578335.

It is an arithmetic number, because the mean of its divisors is an integer number (27578335).

Almost surely, 2^55156669 is an apocalyptic number.

It is an amenable number.

55156669 is a deficient number, since it is larger than the sum of its proper divisors (1).

55156669 is an equidigital number, since it uses as much as digits as its factorization.

55156669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243000, while the sum is 43.

The square root of 55156669 is about 7426.7535976360. The cubic root of 55156669 is about 380.6559975492.

The spelling of 55156669 in words is "fifty-five million, one hundred fifty-six thousand, six hundred sixty-nine".