851793306442 has 8 divisors (see below), whose sum is σ = 1375973802756. Its totient is φ = 393135372192.

The previous prime is 851793306437. The next prime is 851793306491. The reversal of 851793306442 is 244603397158.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 829631327281 + 22161979161 = 910841^2 + 148869^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 851793306442.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16380640483 + ... + 16380640534.

It is a 1-persistent number, because it is pandigital, but 2⋅851793306442 = 1703586612884 is not.

Almost surely, 2^851793306442 is an apocalyptic number.

851793306442 is a deficient number, since it is larger than the sum of its proper divisors (524180496314).

851793306442 is a wasteful number, since it uses less digits than its factorization.

851793306442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32761281032.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 851793306442 in words is "eight hundred fifty-one billion, seven hundred ninety-three million, three hundred six thousand, four hundred forty-two".