85366697749 has 2 divisors, whose sum is σ = 85366697750. Its totient is φ = 85366697748.

The previous prime is 85366697743. The next prime is 85366697807. The reversal of 85366697749 is 94779666358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66262482225 + 19104215524 = 257415^2 + 138218^2 .

It is a cyclic number.

It is not a de Polignac number, because 85366697749 - 2²¹ = 85364600597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85366697743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42683348874 + 42683348875.

It is an arithmetic number, because the mean of its divisors is an integer number (42683348875).

Almost surely, 2^85366697749 is an apocalyptic number.

It is an amenable number.

85366697749 is a deficient number, since it is larger than the sum of its proper divisors (1).

85366697749 is an equidigital number, since it uses as much as digits as its factorization.

85366697749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 411505920, while the sum is 70.

The spelling of 85366697749 in words is "eighty-five billion, three hundred sixty-six million, six hundred ninety-seven thousand, seven hundred forty-nine".