1563452661 has 4 divisors (see below), whose sum is σ = 2084603552. Its totient is φ = 1042301772.

The previous prime is 1563452659. The next prime is 1563452699. The reversal of 1563452661 is 1662543651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1563452661 - 2¹ = 1563452659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1563452621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260575441 + ... + 260575446.

It is an arithmetic number, because the mean of its divisors is an integer number (521150888).

Almost surely, 2^1563452661 is an apocalyptic number.

It is an amenable number.

1563452661 is a deficient number, since it is larger than the sum of its proper divisors (521150891).

1563452661 is an equidigital number, since it uses as much as digits as its factorization.

1563452661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521150890.

The product of its digits is 129600, while the sum is 39.

The square root of 1563452661 is about 39540.5192302782. The cubic root of 1563452661 is about 1160.6329930587.

The spelling of 1563452661 in words is "one billion, five hundred sixty-three million, four hundred fifty-two thousand, six hundred sixty-one".