55506099581 has 2 divisors, whose sum is σ = 55506099582. Its totient is φ = 55506099580.

The previous prime is 55506099563. The next prime is 55506099619. The reversal of 55506099581 is 18599060555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48754848025 + 6751251556 = 220805^2 + 82166^2 .

It is a cyclic number.

It is not a de Polignac number, because 55506099581 - 2¹⁴ = 55506083197 is a prime.

It is a super-2 number, since 2×55506099581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55506099511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27753049790 + 27753049791.

It is an arithmetic number, because the mean of its divisors is an integer number (27753049791).

Almost surely, 2^55506099581 is an apocalyptic number.

It is an amenable number.

55506099581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55506099581 is an equidigital number, since it uses as much as digits as its factorization.

55506099581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430000, while the sum is 53.

The spelling of 55506099581 in words is "fifty-five billion, five hundred six million, ninety-nine thousand, five hundred eighty-one".