1663459738 has 8 divisors (see below), whose sum is σ = 2495383380. Its totient is φ = 831665280.

The previous prime is 1663459717. The next prime is 1663459739. The reversal of 1663459738 is 8379543661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1492817769 + 170641969 = 38637^2 + 13063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1663459739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12108 + ... + 58936.

Almost surely, 2^1663459738 is an apocalyptic number.

1663459738 is a deficient number, since it is larger than the sum of its proper divisors (831923642).

1663459738 is a wasteful number, since it uses less digits than its factorization.

1663459738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64592.

The product of its digits is 3265920, while the sum is 52.

The square root of 1663459738 is about 40785.5334401795. The cubic root of 1663459738 is about 1184.8701663614.

The spelling of 1663459738 in words is "one billion, six hundred sixty-three million, four hundred fifty-nine thousand, seven hundred thirty-eight".