7545643321 has 16 divisors (see below), whose sum is σ = 7859870928. Its totient is φ = 7238246400.

The previous prime is 7545643267. The next prime is 7545643349. The reversal of 7545643321 is 1233465457.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 194295721 + 7351347600 = 13939^2 + 85740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7545643321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7545643421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004901 + ... + 1012381.

It is an arithmetic number, because the mean of its divisors is an integer number (491241933).

Almost surely, 2^7545643321 is an apocalyptic number.

It is an amenable number.

7545643321 is a deficient number, since it is larger than the sum of its proper divisors (314227607).

7545643321 is a wasteful number, since it uses less digits than its factorization.

7545643321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7932.

The product of its digits is 302400, while the sum is 40.

The square root of 7545643321 is about 86865.6624967541. The cubic root of 7545643321 is about 1961.3966271813.

The spelling of 7545643321 in words is "seven billion, five hundred forty-five million, six hundred forty-three thousand, three hundred twenty-one".