1668703540 has 24 divisors (see below), whose sum is σ = 4004888832. Its totient is φ = 572126880.

The previous prime is 1668703507. The next prime is 1668703573. The reversal of 1668703540 is 453078661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1668703507) and next prime (1668703573).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1668703493 and 1668703502.

It is a congruent number.

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, 5959516 + ... + 5959795.

It is an arithmetic number, because the mean of its divisors is an integer number (166870368).

Almost surely, 2^1668703540 is an apocalyptic number.

1668703540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668703540 is an abundant number, since it is smaller than the sum of its proper divisors (2336185292).

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

1668703540 is a wasteful number, since it uses less digits than its factorization.

1668703540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11919327 (or 11919325 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 1668703540 is about 40849.7679307974. The cubic root of 1668703540 is about 1186.1139009446.

The spelling of 1668703540 in words is "one billion, six hundred sixty-eight million, seven hundred three thousand, five hundred forty".