2145868015 has 4 divisors (see below), whose sum is σ = 2575041624. Its totient is φ = 1716694408.

The previous prime is 2145867949. The next prime is 2145868093. The reversal of 2145868015 is 5108685412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2145868015 - 2⁷ = 2145867887 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214586797 + ... + 214586806.

It is an arithmetic number, because the mean of its divisors is an integer number (643760406).

Almost surely, 2^2145868015 is an apocalyptic number.

2145868015 is a deficient number, since it is larger than the sum of its proper divisors (429173609).

2145868015 is an equidigital number, since it uses as much as digits as its factorization.

2145868015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429173608.

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 2145868015 is about 46323.5147090546. The cubic root of 2145868015 is about 1289.8355287779.

The spelling of 2145868015 in words is "two billion, one hundred forty-five million, eight hundred sixty-eight thousand, fifteen".