1812201782553 has 20 divisors (see below), whose sum is σ = 2849596047760. Its totient is φ = 1144548493272.

The previous prime is 1812201782549. The next prime is 1812201782597. The reversal of 1812201782553 is 3552871022181.

1812201782553 is a `hidden beast` number, since 1 + 8 + 1 + 2 + 2 + 0 + 17 + 82 + 553 = 666.

It is not a de Polignac number, because 1812201782553 - 2² = 1812201782549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1812201782499 and 1812201782508.

It is not an unprimeable number, because it can be changed into a prime (1812201782653) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 588757975 + ... + 588761052.

It is an arithmetic number, because the mean of its divisors is an integer number (142479802388).

Almost surely, 2^{1812201782553} is an apocalyptic number.

It is an amenable number.

1812201782553 is a deficient number, since it is larger than the sum of its proper divisors (1037394265207).

1812201782553 is a wasteful number, since it uses less digits than its factorization.

1812201782553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177519058 (or 1177519049 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 1812201782553 in words is "one trillion, eight hundred twelve billion, two hundred one million, seven hundred eighty-two thousand, five hundred fifty-three".