1538668745 has 4 divisors (see below), whose sum is σ = 1846402500. Its totient is φ = 1230934992.

The previous prime is 1538668741. The next prime is 1538668763. The reversal of 1538668745 is 5478668351.

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

It can be written as a sum of positive squares in 2 ways, for example, as 265820416 + 1272848329 = 16304^2 + 35677^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538668745 - 2² = 1538668741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1538668741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153866870 + ... + 153866879.

It is an arithmetic number, because the mean of its divisors is an integer number (461600625).

Almost surely, 2^1538668745 is an apocalyptic number.

It is an amenable number.

1538668745 is a deficient number, since it is larger than the sum of its proper divisors (307733755).

1538668745 is an equidigital number, since it uses as much as digits as its factorization.

1538668745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307733754.

The product of its digits is 4838400, while the sum is 53.

The square root of 1538668745 is about 39225.8683141623. The cubic root of 1538668745 is about 1154.4674981408.

The spelling of 1538668745 in words is "one billion, five hundred thirty-eight million, six hundred sixty-eight thousand, seven hundred forty-five".