85015253509 has 2 divisors, whose sum is σ = 85015253510. Its totient is φ = 85015253508.

The previous prime is 85015253503. The next prime is 85015253537. The reversal of 85015253509 is 90535251058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84978080100 + 37173409 = 291510^2 + 6097^2 .

It is a cyclic number.

It is not a de Polignac number, because 85015253509 - 2³¹ = 82867769861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85015253503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42507626754 + 42507626755.

It is an arithmetic number, because the mean of its divisors is an integer number (42507626755).

Almost surely, 2^85015253509 is an apocalyptic number.

It is an amenable number.

85015253509 is a deficient number, since it is larger than the sum of its proper divisors (1).

85015253509 is an equidigital number, since it uses as much as digits as its factorization.

85015253509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 85015253509 in words is "eighty-five billion, fifteen million, two hundred fifty-three thousand, five hundred nine".