851778962165 has 16 divisors (see below), whose sum is σ = 1055224074240. Its totient is φ = 659368508160.

The previous prime is 851778962159. The next prime is 851778962173. The reversal of 851778962165 is 561269877158.

It is not a de Polignac number, because 851778962165 - 2⁶ = 851778962101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1115516 + ... + 1716954.

It is an arithmetic number, because the mean of its divisors is an integer number (65951504640).

Almost surely, 2^851778962165 is an apocalyptic number.

It is an amenable number.

851778962165 is a deficient number, since it is larger than the sum of its proper divisors (203445112075).

851778962165 is a wasteful number, since it uses less digits than its factorization.

851778962165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610612.

The product of its digits is 50803200, while the sum is 65.

The spelling of 851778962165 in words is "eight hundred fifty-one billion, seven hundred seventy-eight million, nine hundred sixty-two thousand, one hundred sixty-five".