16666380182440 has 32 divisors (see below), whose sum is σ = 37660296871080. Its totient is φ = 6637940257792.

The previous prime is 16666380182369. The next prime is 16666380182447. The reversal of 16666380182440 is 4428108366661.

It is a happy number.

16666380182440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9925637648004 + 6740742534436 = 3150498^2 + 2596294^2 .

It is not an unprimeable number, because it can be changed into a prime (16666380182447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894109789 + ... + 894128428.

Almost surely, 2^{16666380182440} is an apocalyptic number.

16666380182440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16666380182440 is an abundant number, since it is smaller than the sum of its proper divisors (20993916688640).

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

16666380182440 is a wasteful number, since it uses less digits than its factorization.

16666380182440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788238461 (or 1788238457 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 55.

The spelling of 16666380182440 in words is "sixteen trillion, six hundred sixty-six billion, three hundred eighty million, one hundred eighty-two thousand, four hundred forty".