85497772819 has 2 divisors, whose sum is σ = 85497772820. Its totient is φ = 85497772818.

The previous prime is 85497772799. The next prime is 85497772861. The reversal of 85497772819 is 91827779458.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85497772819 - 2¹⁹ = 85497248531 is a prime.

It is a super-4 number, since 4×85497772819⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (85497772319) 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, 42748886409 + 42748886410.

It is an arithmetic number, because the mean of its divisors is an integer number (42748886410).

Almost surely, 2^85497772819 is an apocalyptic number.

85497772819 is a deficient number, since it is larger than the sum of its proper divisors (1).

85497772819 is an equidigital number, since it uses as much as digits as its factorization.

85497772819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71124480, while the sum is 67.

The spelling of 85497772819 in words is "eighty-five billion, four hundred ninety-seven million, seven hundred seventy-two thousand, eight hundred nineteen".