1669979048578 has 16 divisors (see below), whose sum is σ = 2514225153024. Its totient is φ = 831904806880.

The previous prime is 1669979048561. The next prime is 1669979048581. The reversal of 1669979048578 is 8758409799661.

It is a junction number, because it is equal to n+sod(n) for n = 1669979048498 and 1669979048507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4009251 + ... + 4406137.

It is an arithmetic number, because the mean of its divisors is an integer number (157139072064).

Almost surely, 2^{1669979048578} is an apocalyptic number.

1669979048578 is a deficient number, since it is larger than the sum of its proper divisors (844246104446).

1669979048578 is a wasteful number, since it uses less digits than its factorization.

1669979048578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404657.

The product of its (nonzero) digits is 1646023680, while the sum is 79.

The spelling of 1669979048578 in words is "one trillion, six hundred sixty-nine billion, nine hundred seventy-nine million, forty-eight thousand, five hundred seventy-eight".