55428927661 has 2 divisors, whose sum is σ = 55428927662. Its totient is φ = 55428927660.

The previous prime is 55428927649. The next prime is 55428927679. The reversal of 55428927661 is 16672982455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52292255625 + 3136672036 = 228675^2 + 56006^2 .

It is a cyclic number.

It is not a de Polignac number, because 55428927661 - 2⁵ = 55428927629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55428927061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27714463830 + 27714463831.

It is an arithmetic number, because the mean of its divisors is an integer number (27714463831).

Almost surely, 2^55428927661 is an apocalyptic number.

It is an amenable number.

55428927661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55428927661 is an equidigital number, since it uses as much as digits as its factorization.

55428927661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 55.

The spelling of 55428927661 in words is "fifty-five billion, four hundred twenty-eight million, nine hundred twenty-seven thousand, six hundred sixty-one".