851874368557 has 4 divisors (see below), whose sum is σ = 851893901056. Its totient is φ = 851854836060.

The previous prime is 851874368551. The next prime is 851874368581. The reversal of 851874368557 is 755863478158.

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, and also an emirpimes, since its reverse is a distinct semiprime: 755863478158 = 2 ⋅377931739079.

It is a cyclic number.

It is not a de Polignac number, because 851874368557 - 2³ = 851874368549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 851874368492 and 851874368501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851874368551) 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, 9700683 + ... + 9788104.

It is an arithmetic number, because the mean of its divisors is an integer number (212973475264).

Almost surely, 2^851874368557 is an apocalyptic number.

It is an amenable number.

851874368557 is a deficient number, since it is larger than the sum of its proper divisors (19532499).

851874368557 is a wasteful number, since it uses less digits than its factorization.

851874368557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19532498.

The product of its digits is 225792000, while the sum is 67.

The spelling of 851874368557 in words is "eight hundred fifty-one billion, eight hundred seventy-four million, three hundred sixty-eight thousand, five hundred fifty-seven".