1666461121415 has 8 divisors (see below), whose sum is σ = 2000158429680. Its totient is φ = 1332898841152.

The previous prime is 1666461121399. The next prime is 1666461121499. The reversal of 1666461121415 is 5141211646661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666461121415 - 2⁴ = 1666461121399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33729845 + ... + 33779214.

It is an arithmetic number, because the mean of its divisors is an integer number (250019803710).

Almost surely, 2^{1666461121415} is an apocalyptic number.

1666461121415 is a deficient number, since it is larger than the sum of its proper divisors (333697308265).

1666461121415 is an equidigital number, since it uses as much as digits as its factorization.

1666461121415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67514001.

The product of its digits is 207360, while the sum is 44.

The spelling of 1666461121415 in words is "one trillion, six hundred sixty-six billion, four hundred sixty-one million, one hundred twenty-one thousand, four hundred fifteen".