851603916161 has 4 divisors (see below), whose sum is σ = 851664633300. Its totient is φ = 851543199024.

The previous prime is 851603916151. The next prime is 851603916167. The reversal of 851603916161 is 161619306158.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 315422640625 + 536181275536 = 561625^2 + 732244^2 .

It is a cyclic number.

It is not a de Polignac number, because 851603916161 - 2³⁴ = 834424046977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851603916167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30337526 + ... + 30365583.

It is an arithmetic number, because the mean of its divisors is an integer number (212916158325).

Almost surely, 2^851603916161 is an apocalyptic number.

It is an amenable number.

851603916161 is a deficient number, since it is larger than the sum of its proper divisors (60717139).

851603916161 is a wasteful number, since it uses less digits than its factorization.

851603916161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60717138.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 851603916161 in words is "eight hundred fifty-one billion, six hundred three million, nine hundred sixteen thousand, one hundred sixty-one".