1668171738 has 32 divisors (see below), whose sum is σ = 3485607552. Its totient is φ = 531238400.

The previous prime is 1668171737. The next prime is 1668171763. The reversal of 1668171738 is 8371718661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1668171737) 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, 114718 + ... + 128438.

It is an arithmetic number, because the mean of its divisors is an integer number (108925236).

Almost surely, 2^1668171738 is an apocalyptic number.

1668171738 is an abundant number, since it is smaller than the sum of its proper divisors (1817435814).

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

1668171738 is a wasteful number, since it uses less digits than its factorization.

1668171738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14630.

The product of its digits is 338688, while the sum is 48.

The square root of 1668171738 is about 40843.2581707189. The cubic root of 1668171738 is about 1185.9878859976.

The spelling of 1668171738 in words is "one billion, six hundred sixty-eight million, one hundred seventy-one thousand, seven hundred thirty-eight".