1063645561 has 8 divisors (see below), whose sum is σ = 1160640000. Its totient is φ = 966701040.

The previous prime is 1063645543. The next prime is 1063645571. The reversal of 1063645561 is 1655463601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1063645561 - 2¹¹ = 1063643513 is a prime.

It is a super-2 number, since 2×1063645561² = 2262683758870009442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1063645561.

It is not an unprimeable number, because it can be changed into a prime (1063645571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42715 + ... + 62863.

It is an arithmetic number, because the mean of its divisors is an integer number (145080000).

Almost surely, 2^1063645561 is an apocalyptic number.

1063645561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1063645561 is a deficient number, since it is larger than the sum of its proper divisors (96994439).

1063645561 is a wasteful number, since it uses less digits than its factorization.

1063645561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24959.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1063645561 is about 32613.5793957057. The cubic root of 1063645561 is about 1020.7803719866.

The spelling of 1063645561 in words is "one billion, sixty-three million, six hundred forty-five thousand, five hundred sixty-one".