85647928529 has 2 divisors, whose sum is σ = 85647928530. Its totient is φ = 85647928528.

The previous prime is 85647928507. The next prime is 85647928543. The reversal of 85647928529 is 92582974658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45689917504 + 39958011025 = 213752^2 + 199895^2 .

It is a cyclic number.

It is not a de Polignac number, because 85647928529 - 2²⁰ = 85646879953 is a prime.

It is a super-2 number, since 2×85647928529² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85647928559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42823964264 + 42823964265.

It is an arithmetic number, because the mean of its divisors is an integer number (42823964265).

Almost surely, 2^85647928529 is an apocalyptic number.

It is an amenable number.

85647928529 is a deficient number, since it is larger than the sum of its proper divisors (1).

85647928529 is an equidigital number, since it uses as much as digits as its factorization.

85647928529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87091200, while the sum is 65.

The spelling of 85647928529 in words is "eighty-five billion, six hundred forty-seven million, nine hundred twenty-eight thousand, five hundred twenty-nine".