55042661 has 2 divisors, whose sum is σ = 55042662. Its totient is φ = 55042660.

The previous prime is 55042649. The next prime is 55042721. The reversal of 55042661 is 16624055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51394561 + 3648100 = 7169^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 55042661 - 2¹⁴ = 55026277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55042621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27521330 + 27521331.

It is an arithmetic number, because the mean of its divisors is an integer number (27521331).

Almost surely, 2^55042661 is an apocalyptic number.

It is an amenable number.

55042661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55042661 is an equidigital number, since it uses as much as digits as its factorization.

55042661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 55042661 is about 7419.0741336099. The cubic root of 55042661 is about 380.3935465769.

The spelling of 55042661 in words is "fifty-five million, forty-two thousand, six hundred sixty-one".