1816398256446 has 128 divisors (see below), whose sum is σ = 4334223168000. Its totient is φ = 562165857792.

The previous prime is 1816398256391. The next prime is 1816398256457. The reversal of 1816398256446 is 6446528936181.

1816398256446 is a `hidden beast` number, since 1 + 8 + 1 + 63 + 9 + 8 + 2 + 564 + 4 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13475110 + ... + 13609238.

It is an arithmetic number, because the mean of its divisors is an integer number (33861118500).

Almost surely, 2^{1816398256446} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1816398256446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2167111584000).

1816398256446 is an abundant number, since it is smaller than the sum of its proper divisors (2517824911554).

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

1816398256446 is a wasteful number, since it uses less digits than its factorization.

1816398256446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134423 (or 134417 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 1816398256446 in words is "one trillion, eight hundred sixteen billion, three hundred ninety-eight million, two hundred fifty-six thousand, four hundred forty-six".