851818841602 has 4 divisors (see below), whose sum is σ = 1277728262406. Its totient is φ = 425909420800.

The previous prime is 851818841579. The next prime is 851818841603. The reversal of 851818841602 is 206148818158.

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

It can be written as a sum of positive squares in only one way, i.e., 744594684201 + 107224157401 = 862899^2 + 327451^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 851818841602.

It is not an unprimeable number, because it can be changed into a prime (851818841603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212954710399 + ... + 212954710402.

Almost surely, 2^851818841602 is an apocalyptic number.

851818841602 is a deficient number, since it is larger than the sum of its proper divisors (425909420804).

851818841602 is a wasteful number, since it uses less digits than its factorization.

851818841602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425909420803.

The product of its (nonzero) digits is 983040, while the sum is 52.

The spelling of 851818841602 in words is "eight hundred fifty-one billion, eight hundred eighteen million, eight hundred forty-one thousand, six hundred two".