4545321561 has 63 divisors (see below), whose sum is σ = 7523863333. Its totient is φ = 2742604920.

The previous prime is 4545321559. The next prime is 4545321563. The reversal of 4545321561 is 1651235454.

The square root of 4545321561 is 67419.

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

4545321561 is a `hidden beast` number, since 4 + 54 + 532 + 15 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (4545321559) and next prime (4545321563).

It is not a de Polignac number, because 4545321561 - 2¹ = 4545321559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4545321563) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 20023330 + ... + 20023556.

Almost surely, 2^4545321561 is an apocalyptic number.

4545321561 is the 67419-th square number.

4545321561 is the 33710-th centered octagonal number.

It is an amenable number.

4545321561 is a deficient number, since it is larger than the sum of its proper divisors (2978541772).

4545321561 is an frugal number, since it uses more digits than its factorization.

4545321561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 241 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The cubic root of 4545321561 is about 1656.4876576568.

Multiplying 4545321561 by its sum of digits (36), we get a square (163631576196 = 404514²).

The spelling of 4545321561 in words is "four billion, five hundred forty-five million, three hundred twenty-one thousand, five hundred sixty-one".