851973521195 has 4 divisors (see below), whose sum is σ = 1022368225440. Its totient is φ = 681578816952.

The previous prime is 851973521153. The next prime is 851973521213. The reversal of 851973521195 is 591125379158.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851973521195 is a prime.

It is a super-2 number, since 2×851973521195² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 851973521195.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85197352115 + ... + 85197352124.

It is an arithmetic number, because the mean of its divisors is an integer number (255592056360).

Almost surely, 2^851973521195 is an apocalyptic number.

851973521195 is a deficient number, since it is larger than the sum of its proper divisors (170394704245).

851973521195 is a wasteful number, since it uses less digits than its factorization.

851973521195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170394704244.

The product of its digits is 3402000, while the sum is 56.

The spelling of 851973521195 in words is "eight hundred fifty-one billion, nine hundred seventy-three million, five hundred twenty-one thousand, one hundred ninety-five".