1861565063 has 2 divisors, whose sum is σ = 1861565064. Its totient is φ = 1861565062.

The previous prime is 1861565047. The next prime is 1861565119. The reversal of 1861565063 is 3605651681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1861565063 - 2⁴ = 1861565047 is a prime.

It is a super-3 number, since 3×1861565063³ (a number of 29 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1861565063.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861565023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930782531 + 930782532.

It is an arithmetic number, because the mean of its divisors is an integer number (930782532).

Almost surely, 2^1861565063 is an apocalyptic number.

1861565063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861565063 is an equidigital number, since it uses as much as digits as its factorization.

1861565063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 1861565063 is about 43145.8580051434. The cubic root of 1861565063 is about 1230.1537831825.

The spelling of 1861565063 in words is "one billion, eight hundred sixty-one million, five hundred sixty-five thousand, sixty-three".