1820874021877 has 4 divisors (see below), whose sum is σ = 1927984258476. Its totient is φ = 1713763785280.

The previous prime is 1820874021871. The next prime is 1820874021881. The reversal of 1820874021877 is 7781204780281.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1614345583761 + 206528438116 = 1270569^2 + 454454^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820874021877 - 2¹¹ = 1820874019829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820874021871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53555118274 + ... + 53555118307.

It is an arithmetic number, because the mean of its divisors is an integer number (481996064619).

Almost surely, 2^{1820874021877} is an apocalyptic number.

1820874021877 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1820874021877 is a deficient number, since it is larger than the sum of its proper divisors (107110236599).

1820874021877 is a wasteful number, since it uses less digits than its factorization.

1820874021877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107110236598.

The product of its (nonzero) digits is 2809856, while the sum is 55.

The spelling of 1820874021877 in words is "one trillion, eight hundred twenty billion, eight hundred seventy-four million, twenty-one thousand, eight hundred seventy-seven".