85149509609 has 2 divisors, whose sum is σ = 85149509610. Its totient is φ = 85149509608.

The previous prime is 85149509591. The next prime is 85149509629. The reversal of 85149509609 is 90690594158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84580925584 + 568584025 = 290828^2 + 23845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85149509609 is a prime.

It is not a weakly prime, because it can be changed into another prime (85149509629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42574754804 + 42574754805.

It is an arithmetic number, because the mean of its divisors is an integer number (42574754805).

Almost surely, 2^85149509609 is an apocalyptic number.

It is an amenable number.

85149509609 is a deficient number, since it is larger than the sum of its proper divisors (1).

85149509609 is an equidigital number, since it uses as much as digits as its factorization.

85149509609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3499200, while the sum is 56.

The spelling of 85149509609 in words is "eighty-five billion, one hundred forty-nine million, five hundred nine thousand, six hundred nine".