745666538 has 8 divisors (see below), whose sum is σ = 1121499588. Its totient is φ = 371833344.

The previous prime is 745666511. The next prime is 745666553. The reversal of 745666538 is 835666547.

It can be written as a sum of positive squares in 2 ways, for example, as 696062689 + 49603849 = 26383^2 + 7043^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499031 + ... + 500522.

Almost surely, 2^745666538 is an apocalyptic number.

745666538 is a deficient number, since it is larger than the sum of its proper divisors (375833050).

745666538 is a wasteful number, since it uses less digits than its factorization.

745666538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999928.

The product of its digits is 3628800, while the sum is 50.

The square root of 745666538 is about 27306.8954295431. The cubic root of 745666538 is about 906.8070435461.

Subtracting 745666538 from its reverse (835666547), we obtain a palindrome (90000009).

The spelling of 745666538 in words is "seven hundred forty-five million, six hundred sixty-six thousand, five hundred thirty-eight".