1666608219040 has 48 divisors (see below), whose sum is σ = 3937732821288. Its totient is φ = 666580489216.

The previous prime is 1666608219037. The next prime is 1666608219061. The reversal of 1666608219040 is 409128066661.

It can be written as a sum of positive squares in 4 ways, for example, as 1008024032016 + 658584187024 = 1004004^2 + 811532^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232034 + ... + 2202526.

Almost surely, 2^{1666608219040} is an apocalyptic number.

1666608219040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666608219040 is an abundant number, since it is smaller than the sum of its proper divisors (2271124602248).

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

1666608219040 is a wasteful number, since it uses less digits than its factorization.

1666608219040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981241 (or 981233 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 1666608219040 in words is "one trillion, six hundred sixty-six billion, six hundred eight million, two hundred nineteen thousand, forty".