85565573251 has 2 divisors, whose sum is σ = 85565573252. Its totient is φ = 85565573250.

The previous prime is 85565573213. The next prime is 85565573281. The reversal of 85565573251 is 15237556558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85565573251 - 2¹⁵ = 85565540483 is a prime.

It is not a weakly prime, because it can be changed into another prime (85565573201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42782786625 + 42782786626.

It is an arithmetic number, because the mean of its divisors is an integer number (42782786626).

Almost surely, 2^85565573251 is an apocalyptic number.

85565573251 is a deficient number, since it is larger than the sum of its proper divisors (1).

85565573251 is an equidigital number, since it uses as much as digits as its factorization.

85565573251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6300000, while the sum is 52.

The spelling of 85565573251 in words is "eighty-five billion, five hundred sixty-five million, five hundred seventy-three thousand, two hundred fifty-one".