818115640004 has 24 divisors (see below), whose sum is σ = 1632529401048. Its totient is φ = 355380549120.

The previous prime is 818115639989. The next prime is 818115640009. The reversal of 818115640004 is 400046511818.

It can be written as a sum of positive squares in 4 ways, for example, as 99856000000 + 718259640004 = 316000^2 + 847502^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 818115640004.

It is not an unprimeable number, because it can be changed into a prime (818115640009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462734207 + ... + 462735974.

It is an arithmetic number, because the mean of its divisors is an integer number (68022058377).

Almost surely, 2^818115640004 is an apocalyptic number.

It is an amenable number.

818115640004 is a deficient number, since it is larger than the sum of its proper divisors (814413761044).

818115640004 is a wasteful number, since it uses less digits than its factorization.

818115640004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925470215 (or 925470213 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The spelling of 818115640004 in words is "eight hundred eighteen billion, one hundred fifteen million, six hundred forty thousand, four".