1664758667868 has 48 divisors (see below), whose sum is σ = 3979835282976. Its totient is φ = 541295677440.

The previous prime is 1664758667867. The next prime is 1664758667941. The reversal of 1664758667868 is 8687668574661.

It is a junction number, because it is equal to n+sod(n) for n = 1664758667793 and 1664758667802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664758667863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2741580 + ... + 3293292.

It is an arithmetic number, because the mean of its divisors is an integer number (82913235062).

Almost surely, 2^{1664758667868} is an apocalyptic number.

It is an amenable number.

1664758667868 is an abundant number, since it is smaller than the sum of its proper divisors (2315076615108).

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

1664758667868 is a wasteful number, since it uses less digits than its factorization.

1664758667868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557894 (or 557892 counting only the distinct ones).

The product of its digits is 3901685760, while the sum is 78.

The spelling of 1664758667868 in words is "one trillion, six hundred sixty-four billion, seven hundred fifty-eight million, six hundred sixty-seven thousand, eight hundred sixty-eight".