1045644561 has 48 divisors (see below), whose sum is σ = 1755936000. Its totient is φ = 594228096.

The previous prime is 1045644559. The next prime is 1045644563. The reversal of 1045644561 is 1654465401.

1045644561 is a `hidden beast` number, since 1 + 0 + 4 + 5 + 644 + 5 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1045644559) and next prime (1045644563).

It is not a de Polignac number, because 1045644561 - 2¹ = 1045644559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1045644563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71340 + ... + 84738.

It is an arithmetic number, because the mean of its divisors is an integer number (36582000).

Almost surely, 2^1045644561 is an apocalyptic number.

It is an amenable number.

1045644561 is a deficient number, since it is larger than the sum of its proper divisors (710291439).

1045644561 is a wasteful number, since it uses less digits than its factorization.

1045644561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13470 (or 13467 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 1045644561 is about 32336.4277711685. The cubic root of 1045644561 is about 1014.9890592299.

The spelling of 1045644561 in words is "one billion, forty-five million, six hundred forty-four thousand, five hundred sixty-one".