851771872346 has 16 divisors (see below), whose sum is σ = 1321782575400. Its totient is φ = 411179182848.

The previous prime is 851771872321. The next prime is 851771872349. The reversal of 851771872346 is 643278177158.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 705457207225 + 146314665121 = 839915^2 + 382511^2 .

It is not an unprimeable number, because it can be changed into a prime (851771872349) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 799646 + ... + 1530678.

Almost surely, 2^851771872346 is an apocalyptic number.

851771872346 is a deficient number, since it is larger than the sum of its proper divisors (470010703054).

851771872346 is a wasteful number, since it uses less digits than its factorization.

851771872346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751153.

The product of its digits is 15805440, while the sum is 59.

The spelling of 851771872346 in words is "eight hundred fifty-one billion, seven hundred seventy-one million, eight hundred seventy-two thousand, three hundred forty-six".