1864242565 has 8 divisors (see below), whose sum is σ = 2240147448. Its totient is φ = 1489356480.

The previous prime is 1864242503. The next prime is 1864242599. The reversal of 1864242565 is 5652424681.

It can be written as a sum of positive squares in 4 ways, for example, as 264322564 + 1599920001 = 16258^2 + 39999^2 .

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

It is not a de Polignac number, because 1864242565 - 2¹⁷ = 1864111493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250666 + ... + 257995.

It is an arithmetic number, because the mean of its divisors is an integer number (280018431).

Almost surely, 2^1864242565 is an apocalyptic number.

It is an amenable number.

1864242565 is a deficient number, since it is larger than the sum of its proper divisors (375904883).

1864242565 is an equidigital number, since it uses as much as digits as its factorization.

1864242565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509399.

The product of its digits is 460800, while the sum is 43.

The square root of 1864242565 is about 43176.8753501223. The cubic root of 1864242565 is about 1230.7432802326.

The spelling of 1864242565 in words is "one billion, eight hundred sixty-four million, two hundred forty-two thousand, five hundred sixty-five".