745346681 has 4 divisors (see below), whose sum is σ = 748601700. Its totient is φ = 742091664.

The previous prime is 745346669. The next prime is 745346683. The reversal of 745346681 is 186643547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186643547 = 829 ⋅225143.

It can be written as a sum of positive squares in 2 ways, for example, as 638017081 + 107329600 = 25259^2 + 10360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745346681 is a prime.

It is a super-2 number, since 2×745346681² = 1111083349755431522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745346683) 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, 1627166 + ... + 1627623.

It is an arithmetic number, because the mean of its divisors is an integer number (187150425).

Almost surely, 2^745346681 is an apocalyptic number.

It is an amenable number.

745346681 is a deficient number, since it is larger than the sum of its proper divisors (3255019).

745346681 is a wasteful number, since it uses less digits than its factorization.

745346681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255018.

The product of its digits is 483840, while the sum is 44.

The square root of 745346681 is about 27301.0380938161. The cubic root of 745346681 is about 906.6773653552.

It can be divided in two parts, 7453466 and 81, that added together give a palindrome (7453547).

The spelling of 745346681 in words is "seven hundred forty-five million, three hundred forty-six thousand, six hundred eighty-one".