851668442 has 16 divisors (see below), whose sum is σ = 1313936640. Its totient is φ = 413723088.

The previous prime is 851668417. The next prime is 851668451. The reversal of 851668442 is 244866158.

It is a happy number.

It is a super-3 number, since 3×851668442³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 851668393 and 851668402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45203 + ... + 61209.

It is an arithmetic number, because the mean of its divisors is an integer number (82121040).

Almost surely, 2^851668442 is an apocalyptic number.

851668442 is a deficient number, since it is larger than the sum of its proper divisors (462268198).

851668442 is a wasteful number, since it uses less digits than its factorization.

851668442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16765.

The product of its digits is 368640, while the sum is 44.

The square root of 851668442 is about 29183.3589910415. The cubic root of 851668442 is about 947.8876211688.

The spelling of 851668442 in words is "eight hundred fifty-one million, six hundred sixty-eight thousand, four hundred forty-two".