7855198618 has 4 divisors (see below), whose sum is σ = 11782797930. Its totient is φ = 3927599308.

The previous prime is 7855198537. The next prime is 7855198627. The reversal of 7855198618 is 8168915587.

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., 7280014329 + 575184289 = 85323^2 + 23983^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1963799653 + ... + 1963799656.

Almost surely, 2^7855198618 is an apocalyptic number.

7855198618 is a deficient number, since it is larger than the sum of its proper divisors (3927599312).

7855198618 is a wasteful number, since it uses less digits than its factorization.

7855198618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927599311.

The product of its digits is 4838400, while the sum is 58.

The square root of 7855198618 is about 88629.5583764243. The cubic root of 7855198618 is about 1987.8596735141.

The spelling of 7855198618 in words is "seven billion, eight hundred fifty-five million, one hundred ninety-eight thousand, six hundred eighteen".