85179929489 has 2 divisors, whose sum is σ = 85179929490. Its totient is φ = 85179929488.

The previous prime is 85179929459. The next prime is 85179929533. The reversal of 85179929489 is 98492997158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56070451264 + 29109478225 = 236792^2 + 170615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85179929489 is a prime.

It is a super-2 number, since 2×85179929489² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85179929459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42589964744 + 42589964745.

It is an arithmetic number, because the mean of its divisors is an integer number (42589964745).

Almost surely, 2^85179929489 is an apocalyptic number.

It is an amenable number.

85179929489 is a deficient number, since it is larger than the sum of its proper divisors (1).

85179929489 is an equidigital number, since it uses as much as digits as its factorization.

85179929489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117573120, while the sum is 71.

The spelling of 85179929489 in words is "eighty-five billion, one hundred seventy-nine million, nine hundred twenty-nine thousand, four hundred eighty-nine".