85761421181 has 2 divisors, whose sum is σ = 85761421182. Its totient is φ = 85761421180.

The previous prime is 85761421169. The next prime is 85761421201. The reversal of 85761421181 is 18112416758.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79247317081 + 6514104100 = 281509^2 + 80710^2 .

It is a cyclic number.

It is not a de Polignac number, because 85761421181 - 2¹⁴ = 85761404797 is a prime.

It is a super-2 number, since 2×85761421181² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85761421481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42880710590 + 42880710591.

It is an arithmetic number, because the mean of its divisors is an integer number (42880710591).

Almost surely, 2^85761421181 is an apocalyptic number.

It is an amenable number.

85761421181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85761421181 is an equidigital number, since it uses as much as digits as its factorization.

85761421181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 44.

The spelling of 85761421181 in words is "eighty-five billion, seven hundred sixty-one million, four hundred twenty-one thousand, one hundred eighty-one".