1664250343545 has 16 divisors (see below), whose sum is σ = 2662826175360. Its totient is φ = 887591641344.

The previous prime is 1664250343507. The next prime is 1664250343571. The reversal of 1664250343545 is 5453430524661.

It is not a de Polignac number, because 1664250343545 - 2⁷ = 1664250343417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664250343494 and 1664250343503.

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, 1274316 + ... + 2225394.

It is an arithmetic number, because the mean of its divisors is an integer number (166426635960).

Almost surely, 2^{1664250343545} is an apocalyptic number.

1664250343545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1664250343545 is a deficient number, since it is larger than the sum of its proper divisors (998575831815).

1664250343545 is a wasteful number, since it uses less digits than its factorization.

1664250343545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067744.

The product of its (nonzero) digits is 5184000, while the sum is 48.

The spelling of 1664250343545 in words is "one trillion, six hundred sixty-four billion, two hundred fifty million, three hundred forty-three thousand, five hundred forty-five".