1898275863821 has 2 divisors, whose sum is σ = 1898275863822. Its totient is φ = 1898275863820.

The previous prime is 1898275863767. The next prime is 1898275863839. The reversal of 1898275863821 is 1283685728981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1794407598025 + 103868265796 = 1339555^2 + 322286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898275863821 - 2³⁴ = 1881095994637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1898275863871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949137931910 + 949137931911.

It is an arithmetic number, because the mean of its divisors is an integer number (949137931911).

Almost surely, 2^{1898275863821} is an apocalyptic number.

It is an amenable number.

1898275863821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898275863821 is an equidigital number, since it uses as much as digits as its factorization.

1898275863821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92897280, while the sum is 68.

The spelling of 1898275863821 in words is "one trillion, eight hundred ninety-eight billion, two hundred seventy-five million, eight hundred sixty-three thousand, eight hundred twenty-one".