1561605063 has 8 divisors (see below), whose sum is σ = 2116273776. Its totient is φ = 1024003200.

The previous prime is 1561605061. The next prime is 1561605109. The reversal of 1561605063 is 3605061651.

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

It is not a de Polignac number, because 1561605063 - 2¹ = 1561605061 is a prime.

It is a super-2 number, since 2×1561605063² = 4877220745574467938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561605061) 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, 4266498 + ... + 4266863.

It is an arithmetic number, because the mean of its divisors is an integer number (264534222).

Almost surely, 2^1561605063 is an apocalyptic number.

1561605063 is a deficient number, since it is larger than the sum of its proper divisors (554668713).

1561605063 is an equidigital number, since it uses as much as digits as its factorization.

1561605063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8533425.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 1561605063 is about 39517.1489735785. The cubic root of 1561605063 is about 1160.1756231815.

The spelling of 1561605063 in words is "one billion, five hundred sixty-one million, six hundred five thousand, sixty-three".