851874368551 has 2 divisors, whose sum is σ = 851874368552. Its totient is φ = 851874368550.

The previous prime is 851874368549. The next prime is 851874368581. The reversal of 851874368551 is 155863478158.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851874368551 - 2¹ = 851874368549 is a prime.

Together with 851874368549, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 851874368551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851874368581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425937184275 + 425937184276.

It is an arithmetic number, because the mean of its divisors is an integer number (425937184276).

Almost surely, 2^851874368551 is an apocalyptic number.

851874368551 is a deficient number, since it is larger than the sum of its proper divisors (1).

851874368551 is an equidigital number, since it uses as much as digits as its factorization.

851874368551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256000, while the sum is 61.

The spelling of 851874368551 in words is "eight hundred fifty-one billion, eight hundred seventy-four million, three hundred sixty-eight thousand, five hundred fifty-one".