1668396290 has 32 divisors (see below), whose sum is σ = 3279916800. Its totient is φ = 605987200.

The previous prime is 1668396283. The next prime is 1668396293. The reversal of 1668396290 is 926938661.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1668396293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91886 + ... + 108534.

It is an arithmetic number, because the mean of its divisors is an integer number (102497400).

Almost surely, 2^1668396290 is an apocalyptic number.

1668396290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668396290 is a deficient number, since it is larger than the sum of its proper divisors (1611520510).

1668396290 is a wasteful number, since it uses less digits than its factorization.

1668396290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17578.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 1668396290 is about 40846.0070263912. The cubic root of 1668396290 is about 1186.0410987448.

The spelling of 1668396290 in words is "one billion, six hundred sixty-eight million, three hundred ninety-six thousand, two hundred ninety".