55571265347509 has 2 divisors, whose sum is σ = 55571265347510. Its totient is φ = 55571265347508.

The previous prime is 55571265347407. The next prime is 55571265347561. The reversal of 55571265347509 is 90574356217555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35869678156900 + 19701587190609 = 5989130^2 + 4438647^2 .

It is a cyclic number.

It is not a de Polignac number, because 55571265347509 - 2¹⁷ = 55571265216437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55571265347579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27785632673754 + 27785632673755.

It is an arithmetic number, because the mean of its divisors is an integer number (27785632673755).

Almost surely, 2^{55571265347509} is an apocalyptic number.

It is an amenable number.

55571265347509 is a deficient number, since it is larger than the sum of its proper divisors (1).

55571265347509 is an equidigital number, since it uses as much as digits as its factorization.

55571265347509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 198450000, while the sum is 64.

The spelling of 55571265347509 in words is "fifty-five trillion, five hundred seventy-one billion, two hundred sixty-five million, three hundred forty-seven thousand, five hundred nine".