55662521 has 2 divisors, whose sum is σ = 55662522. Its totient is φ = 55662520.

The previous prime is 55662491. The next prime is 55662559. The reversal of 55662521 is 12526655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54922921 + 739600 = 7411^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 55662521 - 2¹⁴ = 55646137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55662221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27831260 + 27831261.

It is an arithmetic number, because the mean of its divisors is an integer number (27831261).

Almost surely, 2^55662521 is an apocalyptic number.

It is an amenable number.

55662521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55662521 is an equidigital number, since it uses as much as digits as its factorization.

55662521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 32.

The square root of 55662521 is about 7460.7319346027. The cubic root of 55662521 is about 381.8161469193.

The spelling of 55662521 in words is "fifty-five million, six hundred sixty-two thousand, five hundred twenty-one".