1668531290 has 16 divisors (see below), whose sum is σ = 3100239360. Its totient is φ = 645882960.

The previous prime is 1668531287. The next prime is 1668531301. The reversal of 1668531290 is 921358661.

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, 2690870 + ... + 2691489.

It is an arithmetic number, because the mean of its divisors is an integer number (193764960).

Almost surely, 2^1668531290 is an apocalyptic number.

1668531290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668531290 is a deficient number, since it is larger than the sum of its proper divisors (1431708070).

1668531290 is a wasteful number, since it uses less digits than its factorization.

1668531290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382397.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1668531290 is about 40847.6595412760. The cubic root of 1668531290 is about 1186.0730877934.

The spelling of 1668531290 in words is "one billion, six hundred sixty-eight million, five hundred thirty-one thousand, two hundred ninety".