819799123042 has 32 divisors (see below), whose sum is σ = 1334357342640. Its totient is φ = 376218501120.

The previous prime is 819799123009. The next prime is 819799123123. The reversal of 819799123042 is 240321997918.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 543155734081 + 276643388961 = 736991^2 + 525969^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3189834 + ... + 3437242.

Almost surely, 2^819799123042 is an apocalyptic number.

819799123042 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

819799123042 is a deficient number, since it is larger than the sum of its proper divisors (514558219598).

819799123042 is a wasteful number, since it uses less digits than its factorization.

819799123042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249846.

The product of its (nonzero) digits is 1959552, while the sum is 55.

It can be divided in two parts, 819799 and 123042, that added together give a square (942841 = 971²).

The spelling of 819799123042 in words is "eight hundred nineteen billion, seven hundred ninety-nine million, one hundred twenty-three thousand, forty-two".