1662066378787 has 16 divisors (see below), whose sum is σ = 1723163673600. Its totient is φ = 1601444409120.

The previous prime is 1662066378757. The next prime is 1662066378829. The reversal of 1662066378787 is 7878736602661.

It is a cyclic number.

It is not a de Polignac number, because 1662066378787 - 2³⁹ = 1112310564899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662066378757) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13104168 + ... + 13230394.

It is an arithmetic number, because the mean of its divisors is an integer number (107697729600).

Almost surely, 2^{1662066378787} is an apocalyptic number.

1662066378787 is a deficient number, since it is larger than the sum of its proper divisors (61097294813).

1662066378787 is a wasteful number, since it uses less digits than its factorization.

1662066378787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128106.

The product of its (nonzero) digits is 170698752, while the sum is 67.

The spelling of 1662066378787 in words is "one trillion, six hundred sixty-two billion, sixty-six million, three hundred seventy-eight thousand, seven hundred eighty-seven".