85511421409 has 2 divisors, whose sum is σ = 85511421410. Its totient is φ = 85511421408.

The previous prime is 85511421403. The next prime is 85511421427. The reversal of 85511421409 is 90412411558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78713913600 + 6797507809 = 280560^2 + 82447^2 .

It is a cyclic number.

It is not a de Polignac number, because 85511421409 - 2²³ = 85503032801 is a prime.

It is not a weakly prime, because it can be changed into another prime (85511421403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42755710704 + 42755710705.

It is an arithmetic number, because the mean of its divisors is an integer number (42755710705).

Almost surely, 2^85511421409 is an apocalyptic number.

It is an amenable number.

85511421409 is a deficient number, since it is larger than the sum of its proper divisors (1).

85511421409 is an equidigital number, since it uses as much as digits as its factorization.

85511421409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 85511421409 in words is "eighty-five billion, five hundred eleven million, four hundred twenty-one thousand, four hundred nine".