85644311387 has 2 divisors, whose sum is σ = 85644311388. Its totient is φ = 85644311386.

The previous prime is 85644311381. The next prime is 85644311429. The reversal of 85644311387 is 78311344658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85644311387 - 2¹⁸ = 85644049243 is a prime.

It is not a weakly prime, because it can be changed into another prime (85644311381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42822155693 + 42822155694.

It is an arithmetic number, because the mean of its divisors is an integer number (42822155694).

Almost surely, 2^85644311387 is an apocalyptic number.

85644311387 is a deficient number, since it is larger than the sum of its proper divisors (1).

85644311387 is an equidigital number, since it uses as much as digits as its factorization.

85644311387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 50.

The spelling of 85644311387 in words is "eighty-five billion, six hundred forty-four million, three hundred eleven thousand, three hundred eighty-seven".