1668333540 has 24 divisors (see below), whose sum is σ = 4671334080. Its totient is φ = 444888928.

The previous prime is 1668333517. The next prime is 1668333559. The reversal of 1668333540 is 453338661.

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, 13902720 + ... + 13902839.

It is an arithmetic number, because the mean of its divisors is an integer number (194638920).

Almost surely, 2^1668333540 is an apocalyptic number.

1668333540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668333540 is an abundant number, since it is smaller than the sum of its proper divisors (3003000540).

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

1668333540 is a wasteful number, since it uses less digits than its factorization.

1668333540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27805571 (or 27805569 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 1668333540 is about 40845.2388902305. The cubic root of 1668333540 is about 1186.0262291736.

The spelling of 1668333540 in words is "one billion, six hundred sixty-eight million, three hundred thirty-three thousand, five hundred forty".