1866565245 has 16 divisors (see below), whose sum is σ = 3014418240. Its totient is φ = 986196864.

The previous prime is 1866565237. The next prime is 1866565313. The reversal of 1866565245 is 5425656681.

It is not a de Polignac number, because 1866565245 - 2³ = 1866565237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1866565194 and 1866565203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579880 + ... + 583089.

It is an arithmetic number, because the mean of its divisors is an integer number (188401140).

Almost surely, 2^1866565245 is an apocalyptic number.

1866565245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1866565245 is a deficient number, since it is larger than the sum of its proper divisors (1147852995).

1866565245 is a wasteful number, since it uses less digits than its factorization.

1866565245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163084.

The product of its digits is 1728000, while the sum is 48.

The square root of 1866565245 is about 43203.7642457228. The cubic root of 1866565245 is about 1231.2542002313.

The spelling of 1866565245 in words is "one billion, eight hundred sixty-six million, five hundred sixty-five thousand, two hundred forty-five".