85874820557621 has 4 divisors (see below), whose sum is σ = 85898562563052. Its totient is φ = 85851078552192.

The previous prime is 85874820557569. The next prime is 85874820557623. The reversal of 85874820557621 is 12675502847858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 912311522500 + 84962509035121 = 955150^2 + 9217511^2 .

It is a cyclic number.

It is not a de Polignac number, because 85874820557621 - 2³⁰ = 85873746815797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85874820557623) 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, 11870997290 + ... + 11871004523.

It is an arithmetic number, because the mean of its divisors is an integer number (21474640640763).

Almost surely, 2^{85874820557621} is an apocalyptic number.

It is an amenable number.

85874820557621 is a deficient number, since it is larger than the sum of its proper divisors (23742005431).

85874820557621 is a wasteful number, since it uses less digits than its factorization.

85874820557621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23742005430.

The product of its (nonzero) digits is 301056000, while the sum is 68.

The spelling of 85874820557621 in words is "eighty-five trillion, eight hundred seventy-four billion, eight hundred twenty million, five hundred fifty-seven thousand, six hundred twenty-one".