1821630486474 has 12 divisors (see below), whose sum is σ = 3946866054066. Its totient is φ = 607210162152.

The previous prime is 1821630486463. The next prime is 1821630486493. The reversal of 1821630486474 is 4746840361281.

1821630486474 is a `hidden beast` number, since 1 + 8 + 2 + 163 + 0 + 4 + 8 + 6 + 474 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1469809495449 + 351820991025 = 1212357^2 + 593145^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1821630486474.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50600846829 + ... + 50600846864.

Almost surely, 2^{1821630486474} is an apocalyptic number.

1821630486474 is an abundant number, since it is smaller than the sum of its proper divisors (2125235567592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821630486474 is a wasteful number, since it uses less digits than its factorization.

1821630486474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101201693701 (or 101201693698 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The spelling of 1821630486474 in words is "one trillion, eight hundred twenty-one billion, six hundred thirty million, four hundred eighty-six thousand, four hundred seventy-four".