6745665424 has 15 divisors (see below), whose sum is σ = 13070363313. Its totient is φ = 3372668448.

The previous prime is 6745665389. The next prime is 6745665439. The reversal of 6745665424 is 4245665476.

The square root of 6745665424 is 82132.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4626720400 + 2118945024 = 68020^2 + 46032^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 318262 + ... + 338794.

Almost surely, 2^6745665424 is an apocalyptic number.

6745665424 is the 82132-nd square number.

It is an amenable number.

6745665424 is a deficient number, since it is larger than the sum of its proper divisors (6324697889).

6745665424 is an frugal number, since it uses more digits than its factorization.

6745665424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41074 (or 20535 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 49.

The cubic root of 6745665424 is about 1889.4769531420.

Multiplying 6745665424 by its sum of digits (49), we get a square (330537605776 = 574924²).

The spelling of 6745665424 in words is "six billion, seven hundred forty-five million, six hundred sixty-five thousand, four hundred twenty-four".