55056006661 has 2 divisors, whose sum is σ = 55056006662. Its totient is φ = 55056006660.

The previous prime is 55056006631. The next prime is 55056006667. The reversal of 55056006661 is 16660065055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49248042561 + 5807964100 = 221919^2 + 76210^2 .

It is a cyclic number.

It is not a de Polignac number, because 55056006661 - 2¹³ = 55055998469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55056006667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27528003330 + 27528003331.

It is an arithmetic number, because the mean of its divisors is an integer number (27528003331).

Almost surely, 2^55056006661 is an apocalyptic number.

It is an amenable number.

55056006661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55056006661 is an equidigital number, since it uses as much as digits as its factorization.

55056006661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 55056006661 in words is "fifty-five billion, fifty-six million, six thousand, six hundred sixty-one".