55665225 has 216 divisors, whose sum is σ = 138928608. Its totient is φ = 21772800.

The previous prime is 55665223. The next prime is 55665277. The reversal of 55665225 is 52256655.

It is not a de Polignac number, because 55665225 - 2¹ = 55665223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55665225.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55665223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 3274417 + ... + 3274433.

It is an arithmetic number, because the mean of its divisors is an integer number (643188).

Almost surely, 2^55665225 is an apocalyptic number.

55665225 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55665225 is an abundant number, since it is smaller than the sum of its proper divisors (83263383).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55665225 is a wasteful number, since it uses less digits than its factorization.

55665225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67 (or 43 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 55665225 is about 7460.9131478660. The cubic root of 55665225 is about 381.8223295004.

The spelling of 55665225 in words is "fifty-five million, six hundred sixty-five thousand, two hundred twenty-five".