85539356729 has 2 divisors, whose sum is σ = 85539356730. Its totient is φ = 85539356728.

The previous prime is 85539356723. The next prime is 85539356843. The reversal of 85539356729 is 92765393558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85513550329 + 25806400 = 292427^2 + 5080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85539356729 is a prime.

It is a super-2 number, since 2×85539356729² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85539356723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42769678364 + 42769678365.

It is an arithmetic number, because the mean of its divisors is an integer number (42769678365).

Almost surely, 2^85539356729 is an apocalyptic number.

It is an amenable number.

85539356729 is a deficient number, since it is larger than the sum of its proper divisors (1).

85539356729 is an equidigital number, since it uses as much as digits as its factorization.

85539356729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236000, while the sum is 62.

The spelling of 85539356729 in words is "eighty-five billion, five hundred thirty-nine million, three hundred fifty-six thousand, seven hundred twenty-nine".