1861368563 has 16 divisors (see below), whose sum is σ = 1921788000. Its totient is φ = 1801820160.

The previous prime is 1861368559. The next prime is 1861368571. The reversal of 1861368563 is 3658631681.

It is a cyclic number.

It is not a de Polignac number, because 1861368563 - 2² = 1861368559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861368263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4145363 + ... + 4145811.

It is an arithmetic number, because the mean of its divisors is an integer number (120111750).

Almost surely, 2^1861368563 is an apocalyptic number.

1861368563 is a deficient number, since it is larger than the sum of its proper divisors (60419437).

1861368563 is a wasteful number, since it uses less digits than its factorization.

1861368563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142.

The product of its digits is 622080, while the sum is 47.

The square root of 1861368563 is about 43143.5807855584. The cubic root of 1861368563 is about 1230.1104981480.

The spelling of 1861368563 in words is "one billion, eight hundred sixty-one million, three hundred sixty-eight thousand, five hundred sixty-three".