1668568398 has 32 divisors (see below), whose sum is σ = 3816395520. Its totient is φ = 476418240.

The previous prime is 1668568393. The next prime is 1668568417. The reversal of 1668568398 is 8938658661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668568393) 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, 55233 + ... + 79923.

It is an arithmetic number, because the mean of its divisors is an integer number (119262360).

Almost surely, 2^1668568398 is an apocalyptic number.

1668568398 is an abundant number, since it is smaller than the sum of its proper divisors (2147827122).

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

1668568398 is a wasteful number, since it uses less digits than its factorization.

1668568398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26312.

The product of its digits is 14929920, while the sum is 60.

The square root of 1668568398 is about 40848.1137630613. The cubic root of 1668568398 is about 1186.0818804511.

The spelling of 1668568398 in words is "one billion, six hundred sixty-eight million, five hundred sixty-eight thousand, three hundred ninety-eight".