85535451509 has 2 divisors, whose sum is σ = 85535451510. Its totient is φ = 85535451508.

The previous prime is 85535451493. The next prime is 85535451527. The reversal of 85535451509 is 90515453558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67871712484 + 17663739025 = 260522^2 + 132905^2 .

It is a cyclic number.

It is not a de Polignac number, because 85535451509 - 2⁴ = 85535451493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85535450509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42767725754 + 42767725755.

It is an arithmetic number, because the mean of its divisors is an integer number (42767725755).

Almost surely, 2^85535451509 is an apocalyptic number.

It is an amenable number.

85535451509 is a deficient number, since it is larger than the sum of its proper divisors (1).

85535451509 is an equidigital number, since it uses as much as digits as its factorization.

85535451509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700000, while the sum is 50.

The spelling of 85535451509 in words is "eighty-five billion, five hundred thirty-five million, four hundred fifty-one thousand, five hundred nine".