1668338738 has 64 divisors (see below), whose sum is σ = 2990736000. Its totient is φ = 689472000.

The previous prime is 1668338729. The next prime is 1668338773. The reversal of 1668338738 is 8378338661.

It is a super-2 number, since 2×1668338738² = 5566708289422865288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1668338738.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2775638 + ... + 2776238.

It is an arithmetic number, because the mean of its divisors is an integer number (46730250).

Almost surely, 2^1668338738 is an apocalyptic number.

1668338738 is a deficient number, since it is larger than the sum of its proper divisors (1322397262).

1668338738 is a wasteful number, since it uses less digits than its factorization.

1668338738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891.

The product of its digits is 3483648, while the sum is 53.

The square root of 1668338738 is about 40845.3025206082. The cubic root of 1668338738 is about 1186.0274609333.

It can be divided in two parts, 166833 and 8738, that added together give a palindrome (175571).

The spelling of 1668338738 in words is "one billion, six hundred sixty-eight million, three hundred thirty-eight thousand, seven hundred thirty-eight".