1815343666340 has 48 divisors (see below), whose sum is σ = 3943852642800. Its totient is φ = 701067128832.

The previous prime is 1815343666337. The next prime is 1815343666387. The reversal of 1815343666340 is 436663435181.

It can be written as a sum of positive squares in 8 ways, for example, as 8561430784 + 1806782235556 = 92528^2 + 1344166^2 .

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 15 ways as a sum of consecutive naturals, for example, 16356956 + ... + 16467564.

It is an arithmetic number, because the mean of its divisors is an integer number (82163596725).

Almost surely, 2^{1815343666340} is an apocalyptic number.

1815343666340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1815343666340 is an abundant number, since it is smaller than the sum of its proper divisors (2128508976460).

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

1815343666340 is a wasteful number, since it uses less digits than its factorization.

1815343666340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138944 (or 138942 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 1815343666340 in words is "one trillion, eight hundred fifteen billion, three hundred forty-three million, six hundred sixty-six thousand, three hundred forty".