1668618368 has 32 divisors (see below), whose sum is σ = 3341125260. Its totient is φ = 830061568.

The previous prime is 1668618359. The next prime is 1668618377. The reversal of 1668618368 is 8638168661.

It is an interprime number because it is at equal distance from previous prime (1668618359) and next prime (1668618377).

It can be written as a sum of positive squares in 2 ways, for example, as 1663987264 + 4631104 = 40792^2 + 2152^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7871 + ... + 58302.

Almost surely, 2^1668618368 is an apocalyptic number.

It is an amenable number.

1668618368 is an abundant number, since it is smaller than the sum of its proper divisors (1672506892).

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

1668618368 is an equidigital number, since it uses as much as digits as its factorization.

1668618368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66384 (or 66372 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 53.

The square root of 1668618368 is about 40848.7254146320. The cubic root of 1668618368 is about 1186.0937205251.

The spelling of 1668618368 in words is "one billion, six hundred sixty-eight million, six hundred eighteen thousand, three hundred sixty-eight".