85621805771 has 2 divisors, whose sum is σ = 85621805772. Its totient is φ = 85621805770.

The previous prime is 85621805693. The next prime is 85621805791. The reversal of 85621805771 is 17750812658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85621805771 - 2¹⁴ = 85621789387 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (85621805791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42810902885 + 42810902886.

It is an arithmetic number, because the mean of its divisors is an integer number (42810902886).

Almost surely, 2^85621805771 is an apocalyptic number.

85621805771 is a deficient number, since it is larger than the sum of its proper divisors (1).

85621805771 is an equidigital number, since it uses as much as digits as its factorization.

85621805771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 85621805771 in words is "eighty-five billion, six hundred twenty-one million, eight hundred five thousand, seven hundred seventy-one".