1664515142446 has 32 divisors (see below), whose sum is σ = 2847121710048. Its totient is φ = 723016074240.

The previous prime is 1664515142419. The next prime is 1664515142471. The reversal of 1664515142446 is 6442415154661.

It is a super-2 number, since 2×1664515142446² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1664515142446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12291421 + ... + 12426103.

It is an arithmetic number, because the mean of its divisors is an integer number (88972553439).

Almost surely, 2^{1664515142446} is an apocalyptic number.

1664515142446 is a deficient number, since it is larger than the sum of its proper divisors (1182606567602).

1664515142446 is a wasteful number, since it uses less digits than its factorization.

1664515142446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162676.

The product of its digits is 2764800, while the sum is 49.

The spelling of 1664515142446 in words is "one trillion, six hundred sixty-four billion, five hundred fifteen million, one hundred forty-two thousand, four hundred forty-six".