1808461381556 has 24 divisors (see below), whose sum is σ = 3388623948360. Its totient is φ = 841478392832.

The previous prime is 1808461381543. The next prime is 1808461381567. The reversal of 1808461381556 is 6551831648081.

It can be written as a sum of positive squares in 4 ways, for example, as 730228357156 + 1078233024400 = 854534^2 + 1038380^2 .

It is a super-2 number, since 2×1808461381556² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149404175 + ... + 149416278.

It is an arithmetic number, because the mean of its divisors is an integer number (141192664515).

Almost surely, 2^{1808461381556} is an apocalyptic number.

It is an amenable number.

1808461381556 is a deficient number, since it is larger than the sum of its proper divisors (1580162566804).

1808461381556 is a wasteful number, since it uses less digits than its factorization.

1808461381556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298820563 (or 298820561 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 56.

The spelling of 1808461381556 in words is "one trillion, eight hundred eight billion, four hundred sixty-one million, three hundred eighty-one thousand, five hundred fifty-six".