1821475428551 has 2 divisors, whose sum is σ = 1821475428552. Its totient is φ = 1821475428550.

The previous prime is 1821475428517. The next prime is 1821475428587. The reversal of 1821475428551 is 1558245741281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1821475428551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1821475428493 and 1821475428502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1821475425551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910737714275 + 910737714276.

It is an arithmetic number, because the mean of its divisors is an integer number (910737714276).

Almost surely, 2^{1821475428551} is an apocalyptic number.

1821475428551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821475428551 is an equidigital number, since it uses as much as digits as its factorization.

1821475428551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584000, while the sum is 53.

The spelling of 1821475428551 in words is "one trillion, eight hundred twenty-one billion, four hundred seventy-five million, four hundred twenty-eight thousand, five hundred fifty-one".