55554661 has 2 divisors, whose sum is σ = 55554662. Its totient is φ = 55554660.

The previous prime is 55554647. The next prime is 55554673. The reversal of 55554661 is 16645555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36978561 + 18576100 = 6081^2 + 4310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55554661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55554661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55554641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27777330 + 27777331.

It is an arithmetic number, because the mean of its divisors is an integer number (27777331).

Almost surely, 2^55554661 is an apocalyptic number.

It is an amenable number.

55554661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55554661 is an equidigital number, since it uses as much as digits as its factorization.

55554661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90000, while the sum is 37.

The square root of 55554661 is about 7453.4999161468. The cubic root of 55554661 is about 381.5693661525.

The spelling of 55554661 in words is "fifty-five million, five hundred fifty-four thousand, six hundred sixty-one".