1863561066 has 16 divisors (see below), whose sum is σ = 3731188800.
Its totient is φ = 620509248.
The previous prime is 1863561031. The next prime is 1863561109. The reversal of 1863561066 is 6601653681.
It is a super-2 number, since 2×18635610662 = 6945719693422112712, which contains 22 as substring.
It is an unprimeable number.
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 in 7 ways as a sum of consecutive naturals, for example, 163471 + ... + 174498.
It is an arithmetic number, because the mean of its divisors is an integer number (233199300).
Almost surely, 21863561066 is an apocalyptic number.
1863561066 is an abundant number, since it is smaller than the sum of its proper divisors (1867627734).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1863561066 is a wasteful number, since it uses less digits than its factorization.
1863561066 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 338893.
The product of its (nonzero) digits is 155520, while the sum is 42.
The square root of 1863561066 is about 43168.9826843302.
The cubic root of 1863561066 is about 1230.5932903552.
The spelling of 1863561066 in words is "one billion, eight hundred sixty-three million, five hundred sixty-one thousand, sixty-six".