55399722723721 has 2 divisors, whose sum is σ = 55399722723722. Its totient is φ = 55399722723720.

The previous prime is 55399722723713. The next prime is 55399722723841. The reversal of 55399722723721 is 12732722799355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50545914489225 + 4853808234496 = 7109565^2 + 2203136^2 .

It is a cyclic number.

It is not a de Polignac number, because 55399722723721 - 2³ = 55399722723713 is a prime.

It is not a weakly prime, because it can be changed into another prime (55399722726721) 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, 27699861361860 + 27699861361861.

It is an arithmetic number, because the mean of its divisors is an integer number (27699861361861).

Almost surely, 2^{55399722723721} is an apocalyptic number.

It is an amenable number.

55399722723721 is a deficient number, since it is larger than the sum of its proper divisors (1).

55399722723721 is an equidigital number, since it uses as much as digits as its factorization.

55399722723721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100018800, while the sum is 64.

The spelling of 55399722723721 in words is "fifty-five trillion, three hundred ninety-nine billion, seven hundred twenty-two million, seven hundred twenty-three thousand, seven hundred twenty-one".