851220121022158 has 16 divisors (see below), whose sum is σ = 1297925953542864. Its totient is φ = 418579901343360.

The previous prime is 851220121022137. The next prime is 851220121022171.

851220121022158 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 851220121022158.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440240235 + ... + 442169542.

It is an arithmetic number, because the mean of its divisors is an integer number (81120372096429).

Almost surely, 2^{851220121022158} is an apocalyptic number.

851220121022158 is a deficient number, since it is larger than the sum of its proper divisors (446705832520706).

851220121022158 is a wasteful number, since it uses less digits than its factorization.

851220121022158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882417747.

The product of its (nonzero) digits is 51200, while the sum is 40.

The spelling of 851220121022158 in words is "eight hundred fifty-one trillion, two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, one hundred fifty-eight".