55661699 has 2 divisors, whose sum is σ = 55661700. Its totient is φ = 55661698.

The previous prime is 55661629. The next prime is 55661719. The reversal of 55661699 is 99616655.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55661699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55661609) 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 as a sum of consecutive naturals, namely, 27830849 + 27830850.

It is an arithmetic number, because the mean of its divisors is an integer number (27830850).

Almost surely, 2^55661699 is an apocalyptic number.

55661699 is a deficient number, since it is larger than the sum of its proper divisors (1).

55661699 is an equidigital number, since it uses as much as digits as its factorization.

55661699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 437400, while the sum is 47.

The square root of 55661699 is about 7460.6768459705. The cubic root of 55661699 is about 381.8142674116.

The spelling of 55661699 in words is "fifty-five million, six hundred sixty-one thousand, six hundred ninety-nine".