55520715109 has 2 divisors, whose sum is σ = 55520715110. Its totient is φ = 55520715108.

The previous prime is 55520715011. The next prime is 55520715137. The reversal of 55520715109 is 90151702555.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55261666084 + 259049025 = 235078^2 + 16095^2 .

It is a cyclic number.

It is not a de Polignac number, because 55520715109 - 2²³ = 55512326501 is a prime.

It is a super-4 number, since 4×55520715109⁴ (a number of 44 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55520715409) 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, 27760357554 + 27760357555.

It is an arithmetic number, because the mean of its divisors is an integer number (27760357555).

Almost surely, 2^55520715109 is an apocalyptic number.

It is an amenable number.

55520715109 is a deficient number, since it is larger than the sum of its proper divisors (1).

55520715109 is an equidigital number, since it uses as much as digits as its factorization.

55520715109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78750, while the sum is 40.

The spelling of 55520715109 in words is "fifty-five billion, five hundred twenty million, seven hundred fifteen thousand, one hundred nine".