85811071220077 has 4 divisors (see below), whose sum is σ = 98069795680096. Its totient is φ = 73552346760060.

The previous prime is 85811071220057. The next prime is 85811071220081. The reversal of 85811071220077 is 77002217011858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85811071220077 - 2¹⁹ = 85811070695789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85811071220077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85811071220057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6129362229999 + ... + 6129362230012.

It is an arithmetic number, because the mean of its divisors is an integer number (24517448920024).

Almost surely, 2^{85811071220077} is an apocalyptic number.

It is an amenable number.

85811071220077 is a deficient number, since it is larger than the sum of its proper divisors (12258724460019).

85811071220077 is a wasteful number, since it uses less digits than its factorization.

85811071220077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12258724460018.

The product of its (nonzero) digits is 439040, while the sum is 49.

The spelling of 85811071220077 in words is "eighty-five trillion, eight hundred eleven billion, seventy-one million, two hundred twenty thousand, seventy-seven".