55939570326821 has 2 divisors, whose sum is σ = 55939570326822. Its totient is φ = 55939570326820.

The previous prime is 55939570326797. The next prime is 55939570326847. The reversal of 55939570326821 is 12862307593955.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46353357388900 + 9586212937921 = 6808330^2 + 3096161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55939570326821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55939570326421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27969785163410 + 27969785163411.

It is an arithmetic number, because the mean of its divisors is an integer number (27969785163411).

Almost surely, 2^{55939570326821} is an apocalyptic number.

It is an amenable number.

55939570326821 is a deficient number, since it is larger than the sum of its proper divisors (1).

55939570326821 is an equidigital number, since it uses as much as digits as its factorization.

55939570326821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472000, while the sum is 65.

The spelling of 55939570326821 in words is "fifty-five trillion, nine hundred thirty-nine billion, five hundred seventy million, three hundred twenty-six thousand, eight hundred twenty-one".