1821168404835 has 32 divisors (see below), whose sum is σ = 3180999759168. Its totient is φ = 884293355520.

The previous prime is 1821168404801. The next prime is 1821168404879. The reversal of 1821168404835 is 5384048611281.

It is a happy number.

It is not a de Polignac number, because 1821168404835 - 2¹⁸ = 1821168142691 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63953746 + ... + 63982215.

It is an arithmetic number, because the mean of its divisors is an integer number (99406242474).

Almost surely, 2^{1821168404835} is an apocalyptic number.

1821168404835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1821168404835 is a deficient number, since it is larger than the sum of its proper divisors (1359831354333).

1821168404835 is a wasteful number, since it uses less digits than its factorization.

1821168404835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127936055.

The product of its (nonzero) digits is 1474560, while the sum is 51.

The spelling of 1821168404835 in words is "one trillion, eight hundred twenty-one billion, one hundred sixty-eight million, four hundred four thousand, eight hundred thirty-five".