55170921761 has 2 divisors, whose sum is σ = 55170921762. Its totient is φ = 55170921760.

The previous prime is 55170921709. The next prime is 55170921769. The reversal of 55170921761 is 16712907155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55168614400 + 2307361 = 234880^2 + 1519^2 .

It is a cyclic number.

It is not a de Polignac number, because 55170921761 - 2¹⁸ = 55170659617 is a prime.

It is a super-2 number, since 2×55170921761² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55170921769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27585460880 + 27585460881.

It is an arithmetic number, because the mean of its divisors is an integer number (27585460881).

Almost surely, 2^55170921761 is an apocalyptic number.

It is an amenable number.

55170921761 is a deficient number, since it is larger than the sum of its proper divisors (1).

55170921761 is an equidigital number, since it uses as much as digits as its factorization.

55170921761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 44.

The spelling of 55170921761 in words is "fifty-five billion, one hundred seventy million, nine hundred twenty-one thousand, seven hundred sixty-one".