1665316738 has 4 divisors (see below), whose sum is σ = 2497975110. Its totient is φ = 832658368.

The previous prime is 1665316733. The next prime is 1665316739. The reversal of 1665316738 is 8376135661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1534053889 + 131262849 = 39167^2 + 11457^2 .

It is not an unprimeable number, because it can be changed into a prime (1665316733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416329183 + ... + 416329186.

Almost surely, 2^1665316738 is an apocalyptic number.

1665316738 is a deficient number, since it is larger than the sum of its proper divisors (832658372).

1665316738 is an equidigital number, since it uses as much as digits as its factorization.

1665316738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832658371.

The product of its digits is 544320, while the sum is 46.

The square root of 1665316738 is about 40808.2925151249. The cubic root of 1665316738 is about 1185.3109115520.

The spelling of 1665316738 in words is "one billion, six hundred sixty-five million, three hundred sixteen thousand, seven hundred thirty-eight".