851071065646 has 4 divisors (see below), whose sum is σ = 1276606598472. Its totient is φ = 425535532822.

The previous prime is 851071065617. The next prime is 851071065679. The reversal of 851071065646 is 646560170158.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 851071065646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212767766410 + ... + 212767766413.

It is an arithmetic number, because the mean of its divisors is an integer number (319151649618).

Almost surely, 2^851071065646 is an apocalyptic number.

851071065646 is a deficient number, since it is larger than the sum of its proper divisors (425535532826).

851071065646 is a wasteful number, since it uses less digits than its factorization.

851071065646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425535532825.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 851071065646 in words is "eight hundred fifty-one billion, seventy-one million, sixty-five thousand, six hundred forty-six".